question about ram for GA-M59SLI-S5

[kayan]

Ok, this is my board GA-M59SLI-S5, I am curious if I will be able to take advantage of RAM that has a native speed of 1066mhz since this mobo only supports 800mhz? Or will the 1066 just scale down to run at 800?

Here are a few RAM choices, which would be the best and most cost effective (performance and price for my system)?

CRUCIAL BALLISTIX TRACER BL2KIT12864AL1065 2GB KIT
CORSAIR TWIN2X2048-8500C5 2GB KIT
KINGSTON HYPER X KHX8500D2K2/2G 2GB KIT

Or would I be better off getting an 800mhz counterpart such as:

CRUCIAL BALLISTIX TRACER BL2KIT12864AL804 2GB KIT
OCZ OCZ2RPR8002GK 2GB KIT

I currently am running this ram: KINGSTON VALUE RAM KVR667D2N5K2/2G 2GB so will I notice any difference?

Thanks for the input already, and if anyone has other suggestions, I'd appreciate it. Oh and by the way, I am running Vista Home Prem 64bit