I wouldn't bother with a 7D or 60D, given that you have the T2i/550D, which has essentially the same sensor - so from a point of view of IQ, you don't get any improvement. The only reason to move to a 7D is if you need environmental sealing, better AF or more fps.
... and better usability (lcd display, back wheel, more firmware features) which is a big plus - I wouldn't want to go below a 60d. But of course this is a bad time to get the 18mp sensor - the old 18mp cameras will be cheaper after the rumored 7d2 update.
To extend that comment: it is probably a good time for buying full frame bodies at the moment, but a bad time for buying crop frame bodies. You do however first need to make your decision whether you want full frame or APS-C.
Right now, we know what full frame bodies Canon is likely to have for the next 3 odd years. Canon still has to play its hand with respect to APS-C, and we will probably know what the next round of bodies will look like by about March next year. - Hopefully, at least, the 7DII (or the 7D's successor) will be known.
For me, I suspect that the 7D will be the last APS-C DSLR body I own. I do still see APS-C having a place for me in a smaller form factor - I am hoping that Canon will soon announce a more advanced EOS-M body - the current one doesn't cut it for me. That will hopefully provide a replacement for my G11.
Either way, it is worth remembering that current APS-C DSLRs are probably providing better IQ than 35mm film. In fact, when I got my EOS 350D and compared to the results from from EOS 650, it was clear that I was at least as well served with the 350D. (That doesn't stop me from shooting the odd film with the 650 for purely sentimental reasons.) We are at a point where we are very privileged in terms of the equipment available to us.
Oh, and for those who argue that you don't need a full frame DSLR for personal use, that is like arguing that that I shouldn't buy a road bike with a 105 groupset for commuting, but ignoring that I do ride 70km a day....