My concern is that for $300 more, I could return my Ultimate iMac (just bought on Sunday) for a base model Mac Pro. I'm a decent gamer, I play daily but not too super serious, my requirement to have the best video card isn't big (obviously, i would have just built a dual 780 desktop for under 3k if it was). I know the Xeon is missing some hardware acceleratoin/instruction sets but will be a beast in anything multi-threaded CPU-bound. The other issue is will dual D300s be more powerful in gaming over the 780M in the iMac.. My guess looking at specs say yes, it's a combined over 2000+ stream processors vs. the 1500ish in the 780M. Of course, Firepro drivers aren't designed with gaming in mind so there's a gaming performance hit there. Lastly, you get the $999 Cinema Display value built right into a iMac vs. no monitor in the Mac Pro.. Trying to take all things into consideration and don't want to have buyer's remorse. I guess I should wait for a proper review of the base model Mac Pro before assuming anything today!