If your reason to watercool is to lower temps and
increase overclockability then i think you're in for a disappointment. (Depending on your hardware)
Why? well i think the newer hardware runs alot cooler so you're more likely going to hit walls due to limitations of the hardware itself, not limitations caused by heat output - which back in lga775 days, the thermal wall was often the first obstacle.
Correct me if i'm wrong, but i believe air cooling on most SB platforms is more then adequate evne for overclocking. If you're going watercooling to increase clocks on a SB platform, i doubt you'd be happy.
Watercooling offers more control over where heat goes (via placement of radiators) and obviously improves temps if they're well placed - nevermind the fact that water will shift the heat quicker.
Apart from that, it's also alot of fun, and makes a rig look very nice:
I don't believe watercooling is any quieter. In fact i'd argue it's noiser as you're bound to need more fans to cool each radiator you use. In the end though, it's noise level is down to you.
Also, in my opinion i think watercooling components such as harddrives, memory, and chipset(s) are a waste of money and unnecessary. It would also make upgrading a more time consuming and expensive process.
CPU and GPU blocks (Ideally with universal brackets to allow for future upgrades) are all you'll need. Oh, and a few copper heatsinks to go over GPU mosfets and VRAM. You could get a full GPU block, but once you upgrade/replace that GPU, it'll need to be sold or binned - again, not worth the purchase, imo.Edited by Thingamajig - 6/1/11 at 5:31am