Thats the best system i could put together with standard watercooling supplies (besides the pump). I guess the best system you could possibly put together would be made out of plumbing supplys and stuff.
Dig a 10ft deep trench around your house, bury 1 1/2" copper pipe there, hook the pipe up to a crazy self built TEC water block, hook the other end of the pipe up to a 100 gallon tank of water, also burried 10ft underground, then use a 3 or 4 of those massive water pumps that the water companies and crap use to supply water to entire towns.
You woundnt need a radiator because the pump and water tank are both buried underground. You would have to use copper pipe since, 1. the stuff is underground. And 2. the PSI of the pump would be so great that regular plastic/rubber tubing would just explide/pop.
The entire setup would cost thousands and thousands of dollars. It would be a much better idea just to buy/build a 50 stage phase change systems for like $5000 instead of spending $500,000 on a crazy water system. Or you could just buy a massive tank of LN2.