ok, according to what ive read, the slit edge has a c/w of 0.23, the white water has a c/w of 0.18. this should, under a 100 watt load, be a difference of about 5 degrees. i think its worth it to get something better than the slit edge. i mean why do u guys build ur own blocks? is it to be able to say i built my own block or is it that and the fact that you want better performance than anything u can buy on the market? cuz im trying to find the absolute BEST BLOCK.
when i decided to get into water cooling, like anything else, i wasnt going to try to go cheap on the parts, for that ill go air (have a zalman{the big one}) i want the best, cuz i want the best performance, not cuz i want to have a water cooling kit.
thanx for all of ur helps, but im still looking for the best block. for now, im waiting on how much the cascade block will be (assuming that its good for P4 chip) and waiting on a comparo of rotors block (mentioned above) and any retail block he's tested. i would love for that block to be tested by overclockers.com because i would have a direct comparison will many other blocks.\
so in short

im still not decided which block to get, anyone else want to shed some light on the subject? i would very much appreciate it