The top tube on my CC is 58cm, which seems to be perfect. (I'm short in leg, long in torso).

Actually, my CC has full ultegra on it. Thats another issue. If I buy a nice road frame I'll probably put the 105 on the CC and move the ultegra over to the new roadie. I haven't done this already because I was thinking about just buying a used Jake the Snake, or something else that would be fun to beat up, and putting the 105 on that.