What is the best water cooling kit I can get sub $300? No answers should at all talk about the all-in-one units, they are a joke. Sorry in advance to those who have them. Thanks for the answers in advance.
I personally would choose the XSPC Raystorm RX240 Universal CPU Water Cooling Kit w/ D5 Variant Pump. $280 at FrozenCPU, don't know if that's a black friday price or not (out of stock there anyway now). Shop around for that kit though, I think it's a good deal. http://www.frozencpu.com/products/17638/ex-wat-229/XSPC...
The most recommended coolant (and best performing) is pure distilled water with a silver 'kill-coil' placed in the res. Sometimes biocides are also used like 'Dead Water' which comes with the kit. I personally use a kill-coil and UV light. Other additives are generally not recommended.
For some interesting reading I'm going to direct you to the water cooling sticky here http://www.tomshardware.com/forum/277130-29-read-first-...
I am not sure why no one has asked this yet but are you looking to only cool the cpu? in my last system the total price of everything was 380 dollers-cpublock,gpublock,420rad,d5p,blueuvcoolant,3x140mmfans,indigoxtream,10xcf,dualbayrez,4mtubeing1/2by3/4- i till would like a second rad in the near future i just need to find the right spot for it and if i want 120mm fans or 140.