There might be other things you can do, than buying another camera...
First thing with any camera is do all you can to avoid underexposure. If you have to increase exposure during post processing, that will always amp up any existing noise in the image.
Depending upon what you use now and how you use it, you might get better high ISO performance out of your camera using a different workflow and image editing software.
For example, both Lightroom 3 (currently V 3.5 actually) and Photoshop CS5 are quite a bit better handling high ISO noise than their predecessors. In the past, with earlier versions of those I'd usually use Canon DPP to handle high ISO images. It worked better than LR2 and CS4. I seldom need to do that now, thanks to the improved noise handling in the two Adobe softwares which saves me a lot of time. (I haven't used Elements, but I imagine it's the same because I think it uses the same ACR or Adobe Raw Converter.)
A separate NR-specific software/plug-in such as Neat Image or Nik DFine might work even better.
I have also heard, but not really proven, that it helps to restrict your camera to using only the "full" ISOs, not the interpolated thirds stop ISOs in between. Most Canon models you can set in the menu or in a Custom Function that ISO only operate in full stops (100, 200, 400, 800, 1600, 3200, 6400, 12800, etc.) Again, I haven't tested this theory myself. I've been in the habit of using only full stops of ISO anyway... it just makes manually changing ISO faster, and I leave shutter speeds and apertures variable in one-third stops, so still have plenty of ability to make very precise settings.
From your post I don't know much about your skill level, specific needs or what gear you have available, but different there are some other things that can help, that you may or may not be aware of or have available:
Depending upon what you have avail., lenses might help, both with I.S. and with larger apertures. WIth static, inanimate objects, I.S. (or the third party equivalent) can help by making possible slower shutter speeds, even handheld, which in turn allow you to keep the ISO set lower.
This goes hand in hand with practicing shooting techniques to improve one's own skills at handholding slower shutter speeds... And using monopods or tripods when possible.
Of course, I.S. and all the skill in the world holding a camera steady can't do much to help with subject motion. For that you still need to keep the shutter speeds up, so a larger aperture lens might help. Zooms max out at f2.8 plus tend to be pretty pricey, large and heavy. Many primes with larger apertures are a lot more affordable, if not as convenient. For example,the inexpensive 50/1.8 gives you 1.333 stops more light than even fastest zoom covering that focal length. OTOH, that lens and many other primes don't have I.S. and a larger aperture means shallower depth of field, too, so it depends a lot upon what you're shooting.
One more possibility... With really high ISO images that are noisy, sometimes it works great to convert them to black & white during post processing. The noise will then look like film grain, which can be a positive rather than a negative, or at least is a lot less detracting from the image. Other monochromatic conversions such as sepia or split-toning might work too.
There are limits and we all have differing ideas about what's acceptible, but I find I can get ISO 3200 out of my cameras that use the same sensor and processor as yours, before noise gets problematic (IMO). For comparison, I'll use my 5DII to ISO 6400.
Regarding camera to camera comparisons and comments....
I've been using the crop more than the 5D lately because I find myself shooting macro...
Interesting... just the opposite... when I shoot macro I'm more likely to use 5DII. It allows smaller apertures and renders a smoother OOF background. Also, macro shots often lend themselves to really big prints, which the 5DII is superior at doing. And, the 5DII's slower AF performance is no hindrence to me, since I normally manual focus macro shots anyway. But, yes, for sports and when I want "more reach" I'll use 7D instead, both for it's better AF tracking ability and it's crop.
Frame rate isn't a really huge thing to me... I try to avoid using a lot of fast bursts simply because I already spend too much time sitting at a computer editing images. A well timed single frame can often be better than "spray and pray" anyway. 5DII and Rebel series cameras give similar frame rates. 50D's 6 fps and 60D's 5 fps aren't really all that different from 7D's real world frame rates. 7D slows down to allow for metering and focusing, anyway, plus will slow when some of the image enhancing features are enabled. You only get the max frame rate consistently when using an adequately fast shutter speed (I'm guessing 1/250 or faster), overriding AF priority, and by "fooling" the camera into not metering the scene (it continues to try to meter even in M mode, and will slow frame rates to do so).
I do think there's less "shutter lag" with 7D. This might be due to the shutter release button, which is similar to what's used on the 1D series. Haven't measured this, and the other cameras are pretty darned responsive too, so the difference is a few milliseconds. That might make a difference when shooting fast action sports, but it's pretty hard to quantify.
T2i/T3i both have 9-point AF, but only the center point is the more sensitive cross-type. They also use a penta-mirror setup, so their viewfinders aren't quite as bright.
60D, 50D, 7D and 5DII all have "true" pentaprisms that make them a bit brighter, but add to cost, size and weight. The 7D's in particular, seems to add a lot of weight in order for the camera to offer a full 100% viewfinder. In fact, the 7D is a wee bit heavier than full frame 5DII!
5DII's AF is similar to T2i/T3i: 9-points and only the center one cross-type. However, unique to the 5D series, it has 6 hidden "expansion/assist" points right around the center point, that can be enabled to help but only work in AI Servo and are not cross-type. You can't see the expansion points in the viewfinder. Also, for some reason the 5DII's AF manages to work, even if pretty slowly, about one stop lower light than 7D and 50D (haven't compared to 60D, but it's AF is so similar to 50D I wouldn't expect it to be any different).
With 60D, all 9 points are cross-type. In the real world, this just makes for a bit more flexibility composing and setting up shots.
60D lacks a PC sync socket, such as is used to fire studio strobes via a sync cord. Of course, more an more people are going to wireless transmitters/triggers of some sort anyway, so this might not matter.
You can add an ST-E2 module to any modern Canon to get wireless flash control that's in some ways better than the built-in version. For one, ST-E2 uses IR to communicate, rather than visible flashes of light from the built-in flash. Also, the built-in flash can overheat with continuous use, and will shut down to protect itself. ST-E2 won't do that, and can control more off-camera flashes.
Problem with all of Canon's wireless off-camera flash control is that it uses IR/light communication... This limits flash setup to line-of-sight, which can be a problem positioning the flashes. The flash's receiving panel has to be facing and able to "see" the camera's transmitter, and vice versa. A radio trigger doesn't have this limitation, would allow much more flexibility positioning the flashes.