Right, this is a real interesting subject and a great idea so how about:
Making your own with 2x226w pelts, 2 decent blocks (DD, Polar Flow etc) and sandwich a copper water exchanger in the middle?
Go extreme, using two mach heads (or a special two headed mach) and sandwich a copper water HX in the middle?
The Swiftech unit has 1/4" waterpipe, whats that all about? I know the review say it's good, I have my reservatiosn about that just based on the flow.
The idea of the chiller in reference to the direct mounted pelts is to try and set it up so that you can avoid the condensation at the cooling point - That is to say the pelt cooling of the liquid is done outside the case and you control the voltage/curent on that to get the lowest possible water temps (set at just above the condensation point).
Very interesting - not directly the answer to GFX cooling - but certainly and idea others shoud follow and refine.
The Coach