I love my 40mm lens now that I have a full-frame body, but I basically never used it on my crop body. It was just too tight, so I kept finding myself having to walk back to ridiculous distances to get decent framing. I would suggest something wider on a crop body like the 60D—say 20mm or 24mm. Just my 2¢.
Of course, if you don't have a camera yet, I'd probably suggest saving up for a 6D. The prime lens lineup seems to be the right lengths for full-frame (and their cinema primes doubly so). That said, if you go with a crop body, I'd seriously consider a 10-22 zoom.