Basically made out of parts I had laying around. I upgraded the cards in my main rig to power this rig, and I purchased the board, CPU, and case with what I had left of my tax returns. Eventually I'll upgrade to an i7 once I get the money, but I felt like getting it together.
The EVGA GTX470s overclocked in SLI do very very well in every single game (max settings/1080p) that I've played. They do tend to run hot, but I have a custom fan profile setup via PrecisionX. Noise isn't exactly a concern considering it is a LAN rig and my main goal was to efficiently cool such a small rig.
I've had to do some slight modifications on the case side to allow the V6GT to fit due to the higher mounting of the CPU on the mobo. I also installed (well, relocated) the orange LED 120mm fan to the side of the case to introduce cool air directly onto the GPUs and CPU cooler intake.
I had some issues with an XSPC Raystorm 750 Pump/Res I bought for my main rig, and now have "fixed" the damaged one. I suspected a large air bubble in the system, or something to the effect of which. This may actually become liquid cooled very soon.