The specs on the machine that you linked are great. It is $150 over your stated budget though.http://www.newegg.com/Product/Product.aspx?Item=N82E16834220733
This is within your stated budget and it will play WoW flawlessly on ultra (I know, it's what I have use). Don't get me wrong, the MSI that you linked has better specs, but it's $150 over your stated budget. If you can afford that MSI then it's the better machine, if not the G72 does play WoW on ultra with 8x AA (multisampling).