I have a 60D and a Rebel XSi and I have used my nephew's T2i, and I vote for the 60D, particularly if the rebates for the 60D reduce the price below the current $888 price at B & H, Amazon, and Adorama. I like both the Rebels a lot, but the 60D has a more substantial build, feels better in the hand, and is overall more pleasurable to use that my XSi. In fact, I am thinking of selling my XSi and getting a second 60D.
That said, I have not seen or used the T3i, but I still expect the 60D to be a bit better and worth the extra money.