So much of this depends on how much of a hurry you are in, what you are trying to do, and how much you want to spend. At my local camera shop I can get a 7D body for $1200, a 60D body for $750, and a T4i body for $600. If you are looking for things around the T4i price range, those options are about as far as you can stretch things with the current models out.
When the T5i comes out, I would guess in the late fall to be in time for Christmas shoppers, it is a safe bet that it will have similar features to the T4i plus slightly better low light performance. It may or may not have new sensor technology, if it does I would expect a stop better low light performance and a stop or two better noise.
The 60D has slightly worse noise than the T4i, better sealed, bit better focusing, and the shoulder display. If you want manual control over ISO, shutter speed, aperture, etc... it has a better user interface. Drawbacks are no wifi or touchscreen.
The 7D is basicly equivalent to the 60D, except with a higher burst rate and much better autofocus.
If image quality is all important, get the T4i. If you are going to take BIF (bird in flight) pictures, the faster autofocus makes the 7D a far better camera. The 60D is somewhere in the middle.