With the money you want to spend right now, I would agree with others and opt for a better lens. I just got into photography two years ago. Well, that is when I got my first dslr. Had P&S for 20 years and love taking pictures. Point being, I got my 40D and at that time, I thought the camera was the biggest factor. Turns out I was wrong. It is in fact the lenses that make the biggest impact to my images. I gave my 28-135 kit lens to my younger brother who has the Xti, and bought a 24-105. Talk about an instant jump in image quality. Wow! Then the 100-400 for wildlife. Then the 10-22 for landscapes. Then a 100 f/2.8 for macro. It is all about the glass man. One disclaimer, I did just buy a new camera myself. But it was long time in the making. However, without getting some decent lenses first, I would have never been able to justify this new 5Dii. Point is, focus on the lenses at first. I think you will see a more immediate improvement in your images in doing so. Also, depending on what you shoot, be sure to invest in a tripod. It is boring. It sucks. But I heard it here two years ago and it is very true. Getting a tripod is the single best thing you can do to improve your images. I have since bought three, upgrading each time in fact. Tripods are worth their weight in gold man. For used cameras, check out Adorama, KEH, B&H, and Usedcameras.com. Never bought used, but in recent weeks scoured over these websites. Some good deals are there, many of which I saw on Adorama. All reputable places, the only one I am not as familiar with is Usedcameras.com but they look totally legit. The first three I mentioned are well known and established for sure.
-Dan
http://www.adorama.com …tal&cat3=Cameras&sf=Price
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Canon 5D Mark II & 50D with 17-40, 24-105, 100-400, 50 f/1.4, 100 f/2.8 macro, and 1.4TC
FEISOL CT-3442 (ARL) tripod w/ Photo Clam 40-NS ballhead