See to me that isn't the ultimate gaming machine. Since 2005 I've been big on playing games on my iMac (under the Windows of the time) because;
-The displays are fantastic. It's all well and good having the best computer hardware on earth, but if you're going to be looking at it on a 20-24" display or (worse still) a HDTV, then that's no good. Games just look mindblowing on this 27" display. I can't wait until a 3D version of this comes out.
-They're quiet. I thought that might have a negative impact on the life of my machines (getting too hot and not doing much about it), but my 6 year old o/c iMac is perfectly alive.
Besides 3 monitors? I used to run a dual display setup and they are not for gaming. The "split" down the middle instantly ruined the immersion in a game. One big monitor or bust.
It also looks hideous, big and heavy. Not the kind of thing I'd want in my office taking up too much space.