Wow, all those links will take me some time to read
That compresor/condenser combo looks nice but 400$ is quite expensive for me, I need to check how much are Danfoss compresors here in Slovenia, there is Danfoss factory just 20km from me so I can get some data from them.
I like your idea of small chiller from unused fluid to cool water for gpu and nb. So like a waterblock/evaporator from the same copper block, is that what you think. I would be perfectly hapy with 10-15 degre C water from the chiller so that condensation problems wouldn't be too big.