Cooler Master 690
Tool-less, quiet fans, 8800 SLI certified and not steel like then 900. The 900 would still be a good buy but many say they prefer the 690.
I have to agree with Avenger_K's quote. The Cooler Master 690 is a brand new case from Cooler Master and it comes at a great price. Tons of ventilation. It can hold Seven 120mm fans. The side vent will even take a 140mm fan. The case has mesh panels.
They got a killer special for it on Newegg.com right now while supplies last.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119137
It is normally $79, they are selling it for $59, and it has a $20 rebate which makes it $39!
BTW, you should probably forget getting 640MB 8800GTSs, and look at getting the 512MB 8800GTs. Less power, more performance. And the 700MHZ clocked 8800GT models even beat out the 8800GTX by 500 points in the 3D 06Mark. And they cost about half as much. (Here's Proof: http://www.fudzilla.com/index.php?option=com_content&task=view&id=3955&Itemid=1)
BTW, has anyone seen the new line of Cooler Master Power Supplies that are out? The old ones were nothing special (The RP series), but the new (RS Series) looks really good. Multiple rails, 80 Plus certified, wrap cables, only produces 17 decibels of noise. They finally made a super PSU. This one has 12 reviews and 100% of the reviews rated it 5 eggs.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171023