Hi,
IMHO, this is not a good power supply for a gaming machine. You will have great difficulty finding any power supply worth much for less than $90 in this wattage range. You might want to take a look at an Enermax, Antec, Fortron, Sparkle, or one of those QUALITY supplies before you purchase. The one you are suggesting IS NOT a quality power supply and the thirty bucks you are talking about saving might be the worst bargain you ever make with this computer.
These are a real bargain:
http://www.newegg.com/Product/Produc...NE&N=0&Ntk=all