The T2i would be a fine starting camera.... If you have a lot of interest in macro, the T3i with it's articulated LCD would be useful for low angle (or high angle) Live View macro shots. 60D, too.
Take a look at the cameras in a store. Some like the small form factor and control layout of the Rebel series... other folks don't and feel more comfortable with a 60D (or 50D).
If at all possible and buying new, buy a kit with a lens. If at all possible, get the 18-135 IS to start with. It should be a good all-around lens, nice upgrade from the 18-55 IS that's often bundled with the cameras. It can focus pretty close, but if you need closer consider a set of macro extension tubes, rather than a dedicated macro lens... at least initially.
If you want wider for landscapes, it's hard to beat the Canon 10-22 for IQ, but Tokina 12-24/4 comes close and is about as well or perhaps better built.
If you are going for a wide lens, then you might opt for a different standard lens. The "best" is the pricey and large 24-70/2.8. 24-105 IS is a little less money, but still pretty expensive. A lightly used 28-135 IS (perhaps bought here on POTN or off local Craigslist) is one of the best bargains... In my area they are running around $200 (for a lens that usually sells for close to $500 with the lens hood). It's USM should focus faster than the 18-135 (which lacks USM), which would be handy when photographing a running dog or other moving subjects.
If you want longer, the 70-200/4 IS is a great, fast focusing, telezoom. A bit pricey, though. There are some 70-300 IS and the 55-250 IS that might serve instead, for considerably less money (but with some limitations, as you might expect).
Lots of possibilities. You might start out with the camera and one "standard zoom" lens for now... plan to add more in the future as you grow and want to be able to do more.
Don't forget to allow for memory cards, extra batteries, perhaps a flash, software, extra computer RAM and hard drive storage space, a camera bag and perhaps a few other things.