I went from a borrowed 550D to a 60D recently and have to say I do not regret it one bit. I was considering getting a 550D myself but after handling the 60D I loved it. Although the IQ from the two will be the same, I found the 60D has significant advantages (such as way more hardware buttons, articulating screen etc.) and all of these things which may seem relatively minor add up and I find it a much more comfortable camera to use. I no longer find myself trawling through menus to find the option I want. I also think it is a much more customisable camera than the xxxD bodies and it just feels so much more solid in the hands. My personal recommendation would be to go for the 60D + a nice lens as, in my opinion, the 7D is lacking a little on some features that I would find valuable (such as the articulating screen) and some people have found that the 60D has had better noise performance than the 7D (don't quote me on that though!).