I've been doing lots of research into whether to go for the i5 or i7 iMac. I'll be using mainly audio applications (Logic, Pro Tools etc) and I've read that currently hyperthreading on the i7 actually hinders performance with those particular software packages. However, I assume it's likely that they'll support hyperthreading pretty soon though? Will the performance increase of the i7 be worth the $200 or should I go for the i5? I guess in a couple of months the i7 cpu on it's own will be around $200 so could I upgrade later in I wanted?