He has asked for advice on which is the best AIO cooler, if he wanted custom water cooling or an air cooler im sure that would have been mentioned in his original post, i mean if he wanted to use a stock hsf he would have done that in the first place right?
I have fit an Antec 620 in to a build recently, the instructions were poor but they all go together pretty much the same so should be easy if you have already fit the corsair.
The idle temp of a 3570k was 20c and around 40c under load running at 4ghz, seemed reasonable temps and looks good in the system. There are some new revisions out now not sure what they are like.
I wasn't aware they were all made by the same 2 companies, so i'd have to agree and say go with the company that offer the best warranty service.