What the hell is a "real DX10 rig" though? The $900 price included it, not sure how you're going to go much higher than the 8800GTS anyway (640MB was in the build BTW). Frankly I don't see DX10, I need solid performance and want to play games. It doesn't make me feel superior knowing I'm running Very High and my neighbors running only Medium... Personally if it was between $600 and $3,000 to play the same game besides visuals I know I'd go with $600 EVERY time.
I wasn't disagreeing with you, I was just adding my opinion. There is no use getting a stripped down DX10 GPU if it cannot handle the games in the near future. I'm thinking of games like Crysis. I think $600 is a little low for a gaming rig, but under $1000 will build a nice rig. The video card is the most import part, skimp on the CPU if you have too, but not the GPU.
$600 might build a computer that can play games, but it won't be a gaming rig.