IllegalPaladin on 12 July 2009
I didn't see any brands that I know of for under $50.
This one is more expensive, but it's also 700watts and it currently has a $20 rebate which puts it at around the same price as other good choices that are only around 550-600 watts.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341019
