Go down to the shops and ask to handle both cameras, then see which one you like better. For 60D, it is a DSLR, quite a bit more beefy and heavy. NEX 7 is smaller (not exactly pocket size though) and had a totally different ergonomic.
Both cameras produce excellent image (nothing to complain over there). The NEX-7 however had electronic viewfinder which some said is better but do note that some would swear by optical viewfinder like those found on DSLR such as 60D.
Frankly, none of us here can tell you want to get or advise on how you would like your camera... however forget about the number of lenses for the camera because for the Sony NEX-7, although native lenses are limited but with a correct adapter, you can still fit on A-mount lenses and retain all the AF capability, plus NEX-7 isn't exactly that small (as compare to the NEX-5n) so, even with bigger lenses, it still handle pretty well.
However, do look at Sony's SLT range of cameras too, not exactly very expensive, and some utilise the same graphic processor and sensor as the NEX-7, so IQ should be similar and the NEX-7.
If for me to choose, I would either go to Canon 60D or a Sony A77, because it suits my style more and I like the handling (although I do own a Olympus OM-D too, more for travelling usage).