is it going into a Generic PC case etc? or a name brand like Dell etc...
I have used the Antec Basiq 350w which i think i paid $40 and it works well and is built pretty well.
Are you only looking to spend $40-$50 ?
This 350w for $60 is one of the only ones with Active PFC, and a single 12v rail of 26amps.
You do however have to use the adapter for SATA but its worth it.http://www.newegg.com/Product/Product.aspx?Item=N82E16817194014
There are so many, just tell us what your setup is like and how much you want to spend.