None of this silly cooling stuff? Apple Mac’s are exactly the same internally components wise and won’t run any cooler then a PC with the exact same parts. Mac’s are built specially and specifically by Apple themselves and will have the ‘silly cooling stuff’ already implemented, but you won’t know in great detail because you didn’t build it yourself. The wikipedia article on the Mac Pro states that it supposedly runs cooler then the Mac G5 because of the Xeon processors that it uses, which would be the thumbs up on behalf of Intel. Not Apple. In which the Xeons can be installed in a ‘normal’ PC. So please, none of this ‘Mac’s are better because they’re cooler’. It just won’t cut it. Apple build their machines to be cool, but so can any PC builder if they want. Apple just have millions of dollars to spend on research and manufacturing.
As to answer you question, water cooling does provide a very efficient way to cool your computer. I hear a bit about how ‘if it leaks then it’ll break your PC’, yeh well…these systems aren’t designed to leak, things do go wrong, but these systems are tested, they don’t release dodgy products on the market, why would they? Yes it may increase the chance of causing damage, but who says that the chance is 100% chance of it going wrong?
However, I would say this, with 6 fans maybe you should check that air flow is correct, as in, you’re not getting pockets of heat, and that you’re bringing in air as well as expelling it (take air in low, take air out high, because heat rises you want to remove warm air).
I think once you optimise your case with air fans, I think it will be okay, water is for enthusiasts who want to squeeze every last drop of power out of their computer by overclocking and want it to be very quiet (these pumps aren’t silent). It’s a matter of whether you have the money and the time to mess around with installing a water based cooling system really, if you are actually having problems with your cooling you may want to do a bit more research into comparisons of air to water.