2700 best is samsung
3200 is corsair
3500 is the corsair or kingston's new stuff ,but is being tested alot still.
i believe in buying something to overclock it to speeds people pay alot extra for.i wouldnt myself just buy corsair 3200 to run 200fsb c2 ,i would only buy it if i wanted ram to run 225fsb c2.maximise my money and my parts.