the highest speed that board supports is DDR2-667, so don't try to get DDR2-800 and expect it to run at its rated speed without having to be overclocked, or you'll just be wasting your money. Kingston, Corsair and OCZ are the only manufacturers i've seen so far that make DDR2-667 sticks... and those 3 are all good brands. Just remember, the lower the ram timings, the better, just find the best balance between timings and cost.
actually this board is a gaming board and 533 667 are the stock rated modules for this board.
im sure the extra bandwidth will be favorable. along with the overclock features.It really depends on your intentions. as far as I know the ddr2 800 rating is what the ram is tested at reliably.
the asus site has a list of compatable memory .
the overclock story on thg is a good starting point . http://www.tomshardware.com/2006/04/11/live_memory_test...
this of course is extreme but shows whats what in stability.
I orderd this corsair setup and will update when I can. http://www.zipzoomfly.com/jsp/ProductDetail.jsp?Product...