Originally Posted by RapidFireGT
So what is it specifically that the more expensive systems have the the cheap ones lack? And has anyone had trouble fitting a WC system neatly in a mid-tower ATX?
Check out some reviews of the thermaltake systems on newegg, you'll consistently read negative reviews of pump failures and water block tops cracking after only a few months.
Good components not only don't fail, they typically are much higher in performace and higher flow rate.
Generally most quality water cooling compontents are available with 1/2" barbs for higher flow rates. They are also generally all copper/brass/derlin type construction so you don't have problems with metals reacting with each other and they won't break like acrylic tops do.
As far as fitment goes, you can easily mount a dual radiator on the back side of most cases using a rad box, all internal is trickier and you would probably have to stick to a single 120mm radiator, but either way with some minor case mods you can get a water cooling setup on just about any case.