I agree with Silencer on most of what he said. Spending $1000 on this stuff is a waste of money. The components you've picked out will buy you only a small performance increase compared to DDR2, but at a huge price premium, and then they will be obsolete at the end of the year anyway when Nehalem comes out. (Well not really obsolete, but they will seem slow and antique compared to what will be available at the end of this year.) Buy a cheap P35 mother board for less than $150, DDR2, and a moderate-priced CPU. Save the rest of the money and upgrade to Nehalem later if you want to.

The only thing I disagree about is a quad vs. dual core CPU. If you're running a lot of WoW's, get a quad.