I am thinking about buy a 4000+ and I want to overclock it as much as possible

gonna be using one of these
http://www.newegg.com/Product/Produc...82E16835118115
and some artic silver 5

what ram should I get to be able to overclock these as much as possible?

12x200 = 2400mhz, so I was thinking maybe 11x250 = 2750 or so...
whatever will get me the max without paying too much for the ram

thanx in advanced,
Byan