Great build so far!
If you are looking for a good midrange Mb, I would recomend either an ASUS P5Q-E or Gigabyte GA-X48-DS4.
If you have more $$ to spend, the Gigabyte's x48 chipset will give you more bandwith with future GPU's.
The ASUS fully supports CrossFire but at a reduced link speed.
With your current setup, if you decide to Cf your 4850 you will still have sufficint bandwith to game at 1920x1200 with no to minimal bottlenecking.
------------------------------If the automobile had followed the same development cycle as the computer, a Rolls-Royce today would cost $100, get a million miles to the gallon, and explode once a year, killing everyone inside.
PSA
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