I think watercooling is the most fun thing have done with pc. Does depend on your case somewhat and whether u want to do cpu+gpu. Recently got a alphacool repack + d5 pump and also have a 360 rad plus gpu+cpu block and the fan controller + tubing/fittings so it's come out around £250-£300. So as estimate you would be looking at $400 for water cooling plus a decent soundcard..
