Hi, other than the obvious difference in screen size, how do the 17" and 20" compare for WinXP gaming. In particular, what difference will the faster processor and larger graphics memory make to games etc. I'd like the 20, but can only really afford the 17. If the difference aint that great, I can be happy. But if there's a big reason to goto the 20, I'd like to know! (when I say 20", I also mean 256MB graphics upgrade).