Best RAM for overclocking?

[wattroll]

I got a new system that i have built, but I'm not quiet sure on the RAM. Here's the hardware i got so far;

Gigabyte GA-P43-ES3G, P43, Socket-775
Intel Core 2 Quad Q8300
Corsair CX 400W PSU
Sapphire Radeon HD 5750 512MB

I would really like some ram that would go perfect with this setup, and go nicely with some some moderate overclocking.

Corsair XMS2 DHX - 4 GB PC2-6400(800Mhz) ( 2 x 2 ) CL4-( 4-4-4-12 ) 2.1V ?

Corsair XMS2 - 4 GB PC2-6400(800Mhz) ( 2 x 2 ) CL5 ( 5-5-5-18 ) 1.8V ?

Corsair Dominator DHX - 4 GB PC2-8500(1066Mhz) ( 2 x 2 ) CL5 ( 5-5-5-15 ) 2.1V ?

Appriciate any contribution.

 

[17seconds]

I know that Dominator RAM is very O.C. friendly, since the option you have listed is already running faster than the XMS2 options, that would be the way to go. Relative to the others, the Dominators are already "overclocked", sort of.