I-Mac for computer audio?

I am thinking of replacing my desktop PC and getting into computer audio at the same time. I was wondereing if I could use an I-Mac instead of the Mac-mini I read so much about. By necessity (wife!), the I Mac would reside some 40 ft. from the rest of my equipment and I definitely want a hardwire connection for SQ. I have read that Mac-mini's are affected by jitter and don't know if the I-Mac would offer improvement in this area or not. I know I would need an outboard DAC but other than that I know next to nothing about computer audio but I'd like to learn. Does my plan (using an I-Mac as a desktop computer AND a music server) sound feasible?