Hello, I am new(ish) to water cooling and want to build a fully fledged system around it. I have no main prefence to price other than not too expensive. I am going to order the NZXT Switch 810 case and the Sabertooth p67 motherboard within a few months, and would like to have decided on a efficient and stylish solution for liquid cooling. So far I have learnt about compression fittings, radiators, pumps and the like, and would certainly like the system to contain compression fittings. I will eventually buy 2 GTX 680 hydro's (if they exist in the future) for SLI. I will be able to get one triple and one double radiator to fit without modding, will it be enough ? I will also do some overclocking, 4GHz or 4.5GHz hopefully.
Current spec (off the top of my head, some figures may be out)
XFX 850w 80+ silver
Asus P67 something (budget ran out)
Cheap case (budget ran out)
That all would appear to work fine. There really isn't much incompatibility except for fitting and tubing size which is easily accounted for. Are you planning to add more radiator space when you add the video cards? You might be alright with a single 480, but I would guess based off some initial thoughts is around 225 watts per card (if the 680 will exist as it appears on paper) and overclocking your CPU, you should be able to handle load on that rad with good fans just fine.
I run 6 Ultra Kaze's on my rads. They are pretty powerful fans...I have 2 - 2000's and 4 - 3000's. All are dialed down to around 1200 rpm most of the time and at full power have provide enough air movement that my case flies itself around my office, tethered only by cables.