I was told on here before to buy from Data Memory Systems. Is this the best place to buy? I'm looking to get a 1 GB stick. DMS lists this as $155 (Samsung original) and for $144 (I assume generic or something?). Also, the RAM for the new Powerbooks, DDR2, is cheaper ($104) then for DDR ($155, $144)?? I thought it was newer and faster, thus wouldn't it be more expensive?