You can do better then that.
Low end Thermaltake's aren't the best.
That unit is an old inefficient design and doesn't even have Active PFC.
Antec NEO ECO 620C 620W =supply your own power cordhttp://www.newegg.com/Product/Product.aspx?Item=N82E16817371031
OZC Stealth2 and ModX units are good for the price also.