DDR2-800 is what you want. 4-4-4-12 timings. If it true you should match your FSB and RAM. I am running a FSB1333 CPU- so I underclocked my RAM to DDR2-667 and tightened the timings to 3-3-3-10.
Do you want to Crossfire?
Yes- x48 board (like Rampage)
No- P45 board is ok, but there is not any reason to buy the Deluxe model. P5Q Pro is just fine at $150.