RE: Cooling
Hi Leo
As if watercooling ever had anything to do with merit over expense/complication :-) Generally speaking it's put on there for bragging rights, a strive for absolute silence, overclocking beyond sane levels and a case of more money than sense!
When you're doing it properly, there can be no fans involved at all - external radiators (Zalman Reserator series), full heatsinks for CPU & GPU, so no residual airflow from graphics cards either.
Just waiting for this nutter's idea to become standardised - watercooled PSUs:
http://www.overclock.net/other-hardware-mods/59036-water-cooled-psu.html
Insurance claim just waiting to happen!