re: Does anyone here play PC primarily?

The pump and reservoir was about $120, the radiators about $120 total, then around $50 each for the blocks, $40 in fans, and $100 in tubing and fittings. Plus $40 for the fan controller, which is essential for non-PWM fans unless you want them loud all the time. Plus, whatever I paid for ramsinks and mosfet sinks for my cards. So, close to $600. XSPC sells kits with very good components. The cost of the cooling goes up significantly when you decide to cool crossfired cards.

There are ways to go cheap, but I was also concerned with aesthetics. Expensive fittings, multiple radiators so that I could optimize space in my case so that I didn't have to mount a big radiator on the outside of my case, plus that pump/reservoir combo is expensive.

I have a 3570k in my other PC with a closed loop cooler on (Antec Kuhler 920). It overclocks decently, but ivy bridges run hotter and have their limitations. My 2600k is at a safe overclock. I didn't like the vcore being at 1.5v for 5.0+ even if the temps never went above 60.

My 6950s are flashed with unlocked shaders. I overclocked them both to 900/1300 at 1.175v, and my load temps are 48C for card 1, and 52C for card 2. And that's during benchmarks/stress tests. They sit at 45-ish in games.

Card 1 is a reference design, perfect in every way. Card 2 is the dirt 3 edition Sapphire, and is crappy for overclocking. The OC i'm sitting on right now is this card's max. My reference design can do much better, but I decided to keep the cards even. No point in going higher, since obviously there's no game that these cards can't handle at max settings on my 1080p monitor.

If you have any questions about water cooling, I'm pretty much a walking encyclopedia.