If you plan to do a lot of video, then the flip screen on the 60D and T3i are critical.
The video image quality among the three are said to be about the same.
I only have the T3i, but specifically chose it over the 60D. My main reason at the time was that I wanted to put the extra $200 to $300 into lenses. My reason now (the original one still stands) is the 3x zoom feature that peederj mentioned. It has been a true life saver in a couple of situations. Plus, it is just really handy. The 60D doesn't have this capability. Put the extra $300 (or, if you're able to afford the 7D, then the extra $700) toward a good lens to benefit both stills and video. I recommend the Tokina 11-16mm 2.8 lens.
And, I would wait another couple of weeks. You still might end up getting the T3i, but you might be able to get it at a cheaper price.