What will you use it for and what is your budget? Why do you want to upgrade/ what do you feel is lacking in your T1i?
Also, it is possible both the T3i and 60D might be refreshed soon. That is an option too.
The 7D has AFMA (to fine tune your lens focus) the 60D does not. Also it has weather shielding and wireless flash triggering and better AF and faster FPS than the 60D. If these are important to you go for the 7D, if not the 60D will do just fine, it has the same sensor as 7D and T3i.
However, I'd still say, if you can wait till April, there could be an new APS-C sensor announced... (T4i or 70D etc)