I had a hiper which has been passed on to my step brother and was very solid, nice and quiet and cool enough, modular system is nice unless you need everything plugged in then it gets messy. Upgraded to a Zippy 600watt, which is totally rock solid so far, being non-modular its a bit odd in a case with the psu at the top. Only £40something though, incredible
i can say the Corsair 520 is a class PSU.. Perfectly stable running my entire system. Q6600, 8800GTS 640MB O/C, RAM, one HDD, W/c pump, CCFL's and All my fans.
I've just killed my OCZ 700W GameXStream but while it worked it worked well. Be warned though it isn't modular and only has 2x6 pin PCI-E, luckily for me there were just enough of every connector so I was left with very little cable mess.