Best memory suggestions for my setup...

Have an ASUS P4C800 E Deluxe with a 2.8C and want best memory availabe for best overclocking results. Cost does not matter. Please give me some suggestions, thanks

Was thinking of getting Corsair XMS Extreme Memory Speed Series1GB(512MBx2) DDR PC-4000PRO or Corsair TWINX1024-3200C2PRO.

As you already have a post in the memory section where it belongs, that is exactly the same, this one is useless and should be deleted. Please try to only post in the relevant section and not twice when once will suffice.