Rate my first Gaming/Budget custom built computer...?

instead of going to windows xp pro. go to media center, that way incase you want to connect your 360 for ultimate gaming you can do it instantly. and don't upgrade to vista just yet, it lags down your gaming, i recomend going with a nvidea GEforce 6600 not a 8600 because the drivers won't support alot of graphics that are older such as manhunt or half life. other then that it sounds fantastic. :)