If you absolutely must go h20, there are some starter kits out there. Kingwin makes one that has both cpu and gpu blocks for around 89 usd at newegg. Also the Thermaltake Bigwater SE is a little more but the tubes are a little skinny and does not have a gpu block, but still does the job. If people say these suck, they are wrong, they are priced decent and will give u better temps, if you want to spend more then of course they suck, but u dont want to spend more. These have good reviews all over the place, of course they arent perfect, they arent priced to be. Google the reviews. I am waiting for a better all in one solution, and saving for it, I am in no rush to oc...until a game bogs my sys down that is.
Oh yeah, Arctic-cooling has a solution for the noisy graphics card and will give you cooler temps, if you dont decide on water. I have seven fans and can barely here em.