First time Builder, Cheap 420 dollar Gaming rig advice

Hello i'm new to both teksyndicate and the computer building world. I need advice and suggestions on building a cheap 400-420 dollar gaming rig (I live in Canada if you were wondering). I decided to use the pc building website commonly used on the site and i messed around and added a few parts together to try and make something. Can you tell me if this system works so that when i finish university in the summer I can begin building it. Any and all suggestions are welcome. However please try to keep the price of the unit as low as possible because school is expensive, haha.


for games only:

Drop the optical drive and get cheaper hard disk, get a better video card (7850/7870/gtx 660/670)