as said, dont go cheap w/ watercooling. if you are good with building, try and let us know if you make a good one ;-) if you are ordering, some places sell crap so its best to go with the best. thats dangerden imo. got the maze2 from them which from comparisons seems to be the best. if you dont wanna spend the $40 some odd for it, check out the amazing waterblock (the sqaure one). its still a good performer. dont know about their polyblock though... id definetely go copper. with that said and done, you can construct a simple bong cooler for cheap (just need pvc, tube, and pump), or grab an old radiator from a car and use that to cool. there are a lot of posts here on stuff like that, check em out. some have links to buy some good, cheap radiators