Yeah, sure you need a better GPU, But on latios case, he should buy a good CPU as well. This is why I talked about CPU only.
Also I said i7 because a better and higher stuff can work for a much long time. Consider that new things are coming to the market everyday and being updated monthly. So if you go for an i7 one, you can keep it for a long time, but i5 supports your needs just for a couple of years.
[Edited by Evanscense, 11/23/2012 6:26:16 AM]