You want brand names selling water cooled (or even frozen) comps ? Go to
www.cray.com and chill out.
It's been happening for supercomputers since the very beginning. But who use those babies ? Scientists. Big industrial R&D teams. Military R&D teams. They know quite well what is a computer.
Now for the mainstream the story is different. Mr John Doe doesn't even know where the f*king power button is ! Simon, HOW can you expect him knowing how to plug in a pump and tubings, or even a waterblock ????
maybe 99% of PC owners *never* opened their comp and barely know what's inside.
Here at work, i saw ppl staring at a beeping server. Heck, i immediately noticed the CPU fan died out, and this very knowledge had me promoted to 'know-all-computer-freak' !!!
Mainstream comps DO NOT have to be opened. If they can remove fans or moving parts (main cause of breakdowns), they will !!!
And definitely no move to 'mainstream' watercooling.
(also, the industrial price of stock HSF is less than $5. beat that.)