I'm slowly planning a new watercooling setup for my future Q6600 (like everyone's else here ) and my main goal is to have something very reliable (it will be running 24/7 at 100% load for folding), not too expensive for nothing and which could be good for many years (it's a big investment so I would like to get a good return in use). For now, the WC setup will be just for the CPU with a GPU added later depending on what video card I will pick in 2-3 months. Overall budget is around 250$. The whole setup will be installed on my Wavemaster case. Before anyone say it's too small, I plan to place the radiator outside on the top so there is plenty of room inside from what I see around. For now, I'm almost settled on the components list : -Swiftech MCRES-Micro res. (Saw a picture on Swiftech site with this installed on the Wavemaster on the hdd support side). This is my firm pick. -Swiftech Apogee GT/GTX or D-Tek Fuzion (depends on pricing and availability). -MCR220 or Black Ice GT Stealth 240 (Open to good suggestions here, only requirements is 2x 120 mm fans and not too expensive). -Laing DDC 3.2 pump (might get a D5 if there is a compelling reason but I would prefer the DDC for space and placement issues). -1/2" ID tubing. The main question here is about the Petra Top ppl is raving about... Knowing my light needs and the case choice, is getting this top absolutely necessary ? If yes, can anyone explain what this top is good for ? I would also like some suggestions about the radiator since this is something I'm truly undecided.