Definitely will take your advice on the TX-2, considering I don't need that much and it has great ratings.
Your sure 650w wont handle two HD4850's? Can't hurt to be on the safe side though, especially for only an extra $10. ($20 extra on newegg)
As for the dominators, $110 after rebate didn't seem that much more than any other RAM I found with same specs (in fact its cheaper than most).
Also, nice save on the Mobo, with the P5Q Deluxe and an HD4850 the first ram slot is not usable, and that would have sucked. Probably will go with the Biostar as I know for sure I'll be able to get at all Ram slots with my card.