I can recommend two sets:
G.Skill F2-6400CL4D-2GBHK running 4-4-3-5 1T @ 420(840) 2.3V
or
A-DATA DDR2-800 Vitesta Extreme running 5-5-4-15 2T @ 564(1128) 2.3V.

I have them in my two sets and the A-DATA is low priced. You canīt go wrong with either of these.