2x256samsung pc2700 should be good
after all you are guaranteed with the ram for at least 166mhz
however one thing im not sure about, the cpu:ram ratios
i dont know 100% if the ratio will just dissapear after a certain fsb, or will it stay no matter what fsb you are at
the reason why i bring this up, is because it will determine whether you should invest in some higher class ram (pc3000 or higher)
if say cpu is 166fsb and there is a 4:5 ratio, you can run the ram at 207.5mhz (415ddr) which couple with dual channel ddr would be awesome to say the least
maybe someone with a granite bay can answer that (somebody on these boards had one for testing and i believe he can, look in in the motherboard forum for the granite bay sticky)