Still keeping within water-cooling you may want to look at building an external water-chiller and pump a water-alcohol mix through your system. Do it right and you could be looking at ~-35C liquid temperatures, and this will give a level of cooling that will be better than what the Vapo/Proms can do. Do it with a tap and reservoir system that allows you to switch between an external water-chiller loop and the in-case radiator (for lanning) and it can be a relatively ugly but portable system. Of course while lanning you'll still have the alcohol/water mix in your loop, but this shouldn't impact performance by more than 2C.
That's the sort of option I'd be looking to expand upon.
The Antex 550W PSU can happily power a 172W TEC at 12V for your GPU, and I've done just this a number of times.
You will need to insulate all surfaces, sockets and tubes that are chilled and exposed to the air otherwise you will get frost build up which will melt and drip water over everything whenever you shut the chiller off.
Bingo - high performance portable lan rig - and promII beating benchmark rig when at home.
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