what ram to get?

im building a computer

e6750, will OC
ga p35 mobo
620hx

so i think i want 4gb of ram, and i know its better to get 2x2gb. so do u guys know any good 2x2gb ram for overclocking? ddr2 800 is probably what i need. correct me if im wrong

also, should i just get the Crucial Ballistix 4x1gb to save money? i will OC my e6750 to at least 3.6 i hope, and higher if possible. will it put too much stress on my northbridge if i OC my 4x1gb? suggestions?