Building a computer and I need some help

Hello. I'm currently in the process of getting a parts list for building a computer. I have a $630 budget, so I'm just looking for an upgrade, I don't need the latest or greatest. I'm looking at

http://secure.newegg.com/WishList/ [...] r=10299905

with this case/power supply combo:

http://www.newegg.com/Product/Comb [...] mbo.198951

How does it look for a budget gamer system? I was also wondering if I should use a 512MB video card ( http://www.newegg.com/Product/Prod [...] 6814161259 ) if I'm running an Acer 22" Widescreen 2500:1 monitor. I didn't know if the 1GB was overdoing it. I'd like to not waste $35 for something that is more than enough. I'm a bit new to building computers. Thanks in advance.