I just picked up the i7. I am coming from a quad 2.66 Mac Pro with 6 GB ram.
I knew the iMac i7 would be faster, but I wasn't prepared for how much faster. This thing screws. It absolutely SCREWS. I could get about 40fps on Handbrake encodes with the Mac Pro, and the i7 was hitting about 185fps peak. Everything runs smoothly, and all the Steam games run at native resolution without any stuttering.
Get the i7.
I knew the iMac i7 would be faster, but I wasn't prepared for how much faster. This thing screws. It absolutely SCREWS. I could get about 40fps on Handbrake encodes with the Mac Pro, and the i7 was hitting about 185fps peak. Everything runs smoothly, and all the Steam games run at native resolution without any stuttering.
Get the i7.