I've got the Hiper 580w Type-R and it is quieter than my old Antec TP 2.0 550w, which blew up on me. It also has a open "mesh" style casing which means it runs cooler at lower fan speeds than closed casing PSU's, and the modular cables look awesome in my case, if aesthetics are something you value. It hasn't had any trouble with voltage and my system hasn't had any random reboots since I installed it two months ago and I do my fair share of hardcore gaming.
I'd highly recommend the Hiper, but I have heard good things about the Liberty as well, so either would be a good choice.