Budget gaming rig under $600

Hey guys,

This is the second build I'm building, and you guys helped me a lot with my first one. I'm building this computer for a friend who was otherwise going to go pay best buy or future shop the same amount for a piece of trash. So I've compiled a list of parts I have so far, but I need help slimming it down to fit the budget, and finding the last few parts.

Case: $79.69 http://www.directcanada.com/products/?sku=11130AC5964&v...
Monitor: Do not need atm.

Mobo: $83.35 http://www.directcanada.com/products/?sku=11830BD2027&v...
Ram: $45.79 http://www.directcanada.com/products/?sku=15380BD2304&v...
HDD: $84.69 http://www.directcanada.com/products/?sku=25350DR0783&v...
GPU: NEED
PSU: NEED
DVDrw: $22.00 http://www.directcanada.com/products/?sku=14040AC0054&v...

All parts mentioned so far and peripherals have come to $344.25 before taxes.


Additional info: Preferred sites are www.directcanada.com www.newegg.ca www.ncix.com and www.tigerdirect.com/ca. Buy date is between Friday April 5th and the one after. I am willing to switch any of these parts for a better part, including the mobo. Combo deals would be much appreciated. Want to run games like COD Black Ops, and similar games decently (if at all). My friend likely won't overclock, but might be interested to replace parts in the future, if that means anything. Lastly, cheap is good, but we're happy to fill the budget as much as possible, without exceeding. If I'm missing anything from the list, just let me know.

Thanks a lot in advance!