1. HT does not help in games FYI
2. 4GB RAM for this sort of rig would so
3. A few things u should know about SATA/USB 3.0 tech and mobos as shown by our very own forums here
USB 3.0, SATA 6Gb/s, Motherboards, And Overcoming Bottlenecks
http://www.tomshardware.com/reviews/usb-3.0-sata-6gb,2583.html
Also note that LGA 1156 shall be usurped by LGA 1155 as soon as end of this year/possible Q1 next year if u intending to sink a wee bit on chip + board FYI...
http://www.bit-tech.net/hardware/cpus/2010/04/21/intel-sandy-bridge-details-of-the-next-gen/
4. P7P55D-E PRO is 8/8 for mult GPU and with Point #3 and if u willing to burn $2k are u sure it's worth it?