I'm a big supporter of mac, and I believe that with Apple you do get what you pay for.
I realize that quad-core xeon chips are not cheap, but I would be willing to bet less than 5% of the people who purchase these new powerhouse systems will actually make use of all 8 cored, beyond that for a $2,8000 system, that video card is complete trash. World of Warcraft (years old and not demanding by any stretch of the imagination), the only base or reference that I have for "OS X gaming" can't even run smoothly. I have the 30" monitor and in 2560x1600 it chugs with all filtering disabled. Don't even ask about Crysis or Everquest 2 under Vista... . I realize mac pro's aren't designed to be gaming rigs, but for $2800 I would hope it would be on part with a $700 new egg generic pc, but it isn't in this case.
I appreciate that they offer the 8800GT (at a premium) but we can't even get our hands on those. I ordered one a month ago from macmall, but no sign of the card. With each phone call asking where it is I get a new date of when they are expected to show up.
Ive got the 17" mac book pro, iphone, new 8core mac pro, and a mac mini hooked to my tv in the living room. Not a mac-hater by any stretch of the imagination. I'm just really let down by the performance of the stock video card, and the delay on the upgrade.