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I was debating over USB 3.0 as well but fortunately Apple made my decision easy when they announced they were killing off the 30 inch cinema display which I wanted so I decided to forego usb 3.0 and ordered my mac pro and cinema display instead.
 
Great for gaming. Hope the 5870 is not too noisy for you. Bang for buck I disagree with many of the folks here and think the base quad is the best value for many of us.

My current ppc pro is pretty loud, so I am sure it wont bother me.
I upgraded the graphics card a few years ago, and it always sounds like a plane is taking off sometimes.

Do you game in osx or windows

Btw
For the custom pros, it says ships in 3-5 days, do most ship out in 3?
 
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