Upgrading cpu for girlfriend. Basically plays WoW, raids, etc. The 630 or 635 is like $30 more than the 435 or 440. So I'm trying to figure out, for basically the same gaming performance, if the extra $30 is going to be worth it. Thoughts? I did a quick search through the threads but there wasn't anything that specific. I'm sure the 630 would be a better overall chip, but with pretty limited usage I'd rather get what fits her needs. Thanks. Oh, rest of the system is basically my sig.