I'm new to this and researching it. I have an Opteron 170 that does 2750 at 1.45vcore on an xp-90 due to one bad core. That core does 2850 at a much higher vcore of ~ 1.55. I would like to know what are the best cpu and 7800GT water blocks as far as cooling is concerned. Good looks would be nice but cooling is most important. I'm currently looking at Danger Den Maze 4, Swiftech Apogee/Storm. And, which pumps are good and don't produce much heat and low profile at the same time too? My budget is 150 to a max of $250 bucks.