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?ProductCode=85025-5