Pretty much everyone will recommend a corsiar 520/620, and whilst I agree they do seem solid units. I do have some gripes with mine compared to my old Hiper 530.
Firstly, the corsair 520 I have is not 100% modular, automatically giving me one extra un-needed cable.
Secondly, it seems a lot lounder (people may well disagree here) and I have no tangible way of measuring it, but it definately does seem that way.
Thirdly, the range of cables didn't quite match my components as well as the hiper, leaving me another cable I could have done without.
Many will say 'don't listen to me' cos Hipers have load of problems etc etc, but in my limited experience, I'm not as happy with the Corsair as I thought I would be