Sounds like you have too much money.
Nope, but computers are about the only thing I buy for myself. I'm usually a fan of the "make it last" perspective, but I have to say I've been a little disappointed by my current Macbook. I like portability in a portable, and my laptop before the Macbook was a 12-inch Powerbook G4, which I still adore; I just need more processor than it can offer. The blackbook to me feels cheap in comparison to the nice aluminum case on the Powerbook, and I have been disappointed by the X3100 despite low expectations. Therefore, aluminum Macbook + better graphics = Day One Purchase for me.
Mattcube64, I don't plan on installing Windows so I don't think I'll be able to check any of those. I spend all my time in OSX, and I really dislike rebooting for games. Sorry for being unhelpful.
ArtHistoryMajor, I graduated from Mason about two years ago, and I'm now taking classes there again. I've had some great times, but I feel like a permanent resident of the campus at this point...

I can also run a comparison test with my 12' PB if that would be helpful to you. Mine is the last one, with the GeForce Go5200 and 786 MB of RAM.
EDIT: palebluedot, if there's a free demo I'd be happy to try that out for you. Let me know if you have any particular settings you'd like me to try or specific scenarios to test.