Triple 6950 is way too overkill.
6950 CF is good enough you can max out all games in the planet with this.
Or even a GTX580 single card is also good. CF/SLI options do generate a lot of heat so take care of that.
Other option would be the GTX570 SLI. You would get the benefits of CUDA, PhysX and all the proprietary stuff that nVidia have.
For the motherboard stick to Asus.
Agreed; get outta my head hellstorm!