Rosewill PSU's have been making a name for themselves and I even have an RP550V2-S-S2 powering my system right now.
I had that exact same PSU to power my system I bought for Christmas and It is still running in a friends computer to date with no problems. For the price you really cant beat the clean power that comes out of it on a tight budget. The reviews on it are just as good as the FSP 450w you will notice because honestly Rosewill do make the best budget PSU's you can buy and I am a huge fan of them. My Ultra X-Finity died on me in 2 months and those are recommended for budget however the RD450 I picked up for 35 at Christmas which people told me I would regret except it's still kicking.