hi all, i bought a compaq presario 2500, 2150 US model number, a few weeks ago, it came stock with 256mb's of ram. I want 1024Mb's of ram, 2 sticks of 512. My question is, what kind do i get? and where do i get it from? I dont know if i should get pc2100 or like pc2700 or if i need like pc133, which kind do i need?