Just in case anyone was wondering, the stock powersupply in that machine was 230w.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371005 - 34A 12v rails, 380w
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153052 -29A 12v rails 500w.
Both are good brands and both are rated at 5 eggs. I would pick the Antec over the thermaltake one.
Tease.