The sticky has a lot of stuff if you don't know anything about liquid cooling. It doesn't tell you which parts are better though.
Umm... what? In the sticky:
Tests on equipment, not reviews, truly scientific testsXtremeSystems
More rad testingskinnee labs
Host for Martins lab and some newer testsskinnee labs
Test results, very technical
You can't get anything better than the apogee XT at the moment. That thing beat the heat killer by 1C and it cost less.
Yes, it beat the HK 3.0 HOWEVER, the HK 3.0 LC can be had for 1/2 the price of the XT for ~2-3C hit in most cases.http://www.skinneelabs.com/i7-blocks-2.html
Given that we don't even know the specs of OP's system or his skill level in OCing I doubt he'll find much difference.
( Distilled Water and AF)
DO NOT run Anti freeze in a loop (esp. since you don't have mixed metals). Get some PTNuke or KillCoils.