Another "welcome to the forums". I spent a couple of months in Gävle back in 2000. Glad darn near everyone there speaks English.
From a cost standpoint, you are facing a losing proposition. Even at 50 gph and your quoted cost of $400/year, that's way more than a "conventional" system with pump and radiator. Figuring about 42 watts for a pump and fans equates to 1 kW-hr/day. I pay around 7 cents per kW-hr, so $0.07 * 365 = $25.55 per year.
You mentioned peltier. I'm assuming you would have it directly on the chip and use the water to cool it. In this case, the difference in performance using 17°C water vs, say 30°C water is certainly measureable. But how much more do you suppose you would gain using tap water vs radiator-cooled water? I'd wager keeping radiator-cooled water below 30°C would be no challenge for you.
You could also consider even lower flow rates. At 25 gph, the water would warm about 1°C for every 75 watts you dump into it. Even a high-end CPU with peltier would load you up with no more than 225 watts, so a 3°C temperature rise. Now your cost is $200/year. Consider a 6°C rise and your cost is $100/year. At these low flows, you would need a block that was efficient, but it's doable.
Well, the choice is yours. If nothing else, folks here will be curious to know how things turn out for you.
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