If you want watercooling performance, you will need to stay away from the kits. The only way to guarantee that level of performance is to build a custom loop, and to do that, you will need to do a lot of research and spend a bit more money.
A good custom watercooling loop will run you about $250-350 just to cool the CPU. There is nothing that you could buy in a kit that performs at this level for this price. You can spend more on phase-change, but then you have to use conformal coating on all your boards and cover all exposed metal with neoprene and dielectric grease because you are cooling below ambient temperature. Or you can go to the extreme of LN2, but this kind of cooling is only effective for a few hours at a time, and you still have to use all of the safety precautions that you have to do with phase-change.