Well frankly my current setup which I had now for around 4 years was running on a cheapo PSU that came with a case for 3 years. Only branded PSUs I've had were 2 Enermax ones, one I couldn't even get to work out the box (bought second hand, was RMA replacement) and now the second one seems to be packing in after less than 3 months. Currently have a Sumvision PSU in (basically cheapest thing in my local PC shop) until I sort out the Enermax, but in my experience cheapo PSUs have proved to be more reliable for me :?
P.S. I'm not advocating that people use cheapo PSUs I just seem to be having bad luck with Enermax.