there are only a few 4GB kit that advertised as ddr2-1200 as far as i know, A-Data DDR2-1200+, Apogee GT and G.Skill 9600 PI,
the g.skill one seems to be the best and also still available widely at this time.
also OCZ just released a ddr2-1200 4GB kit but it's spec'ed at 6-6-6-18.
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