ResidentNumb3rs :
these will be my specs
ASUS P6T
2 X GAINWARD GTX 275(obviously these depend on this conversation
COOLMASTER RC690
SEAGATE SATA 1TB
SATA SAMSUNG
CORSAIR 850W HX-850
6G KIT (3X3G) DDR3 1600 G.SKILL-NQ
ASUS VW246H BLACK 24" 2MS 1920x1080
PROLIMATECH MEGAHALEMS CPU COOLER
INTEL i7-920
I purchased the P6T, and if I could do it again, I'd get the P6T Deluxe V2 due to the extra spacing for SLI setups. The PCI-E slots are a little too close on this board. My GPUs get very hot under load if fan speed isn't >60%.
You could even use the same PSU I have for the setup and still have room to expand in the future. 750W is a lot of power, even 75% of 750W is a lot under full load. I've seen an i7 and GTX295 draw around 400W during 3DMARK06 on Bit tech's website.
Everything else looks great, although I would recommend better case fans to move the heat from your system faster. I have a Sythe Ultra Kaze 3K RPM 120mm fan for exhaust. The fan is rated for 133CFM and I have it at 2K RPM. It moves lots of air, but still feels like not enough.
I originally looked at the Asus monitor you're considering and get the Acer instead, as it had better reviews/image Q. Looks like a great system, good luck!