should i upgrade from my xsi to t3i or t4i? I got lenses...
The biggest thing with the T4i would be the autofocus during video, I think. If you aren't planning on using your camera for lots of videos, it's probably not a huge deal. This is really good bang-for-buck for entry-level photography.
T4i also has auto chromatic aberration, a feature that was found on more expensive cameras. It makes it a lot more point-and-shoot friendly.
Anyone else more familiar wanna chime in? I'm just recalling stuff I've read here and there.