I am Not a Geek dot com have posted a review of the 450 watt Enermax EG465P-VE power supply. If you need more power to run your overclocked processors or other peripherals then this may suit you. Heres a bit:
"There is one problem you might run into. It seems more recently some cases are made so that the power supply is mounted, upside down. With most power supplies there is no different between the top and the bottom so that is fine. Obviously you are going to have a problem with this unit because of the second fan on the bottom. If you have to mount it upside down, having a fan that is right against the top of your case isn't going to do you much good at all."