im upgrading my second rig which i use as a linux server but want to turn it into a decent second gamin rig. (i will virtualize linux once i install windows 7.) anyway, it has a 1.8ghz core2duo and an onboard 9300. i only want to spend $300 on the upgrade between the CPU and GPU. the cpu obviously must be socket 775 and the gpu has to be nvidia cause i want to run hybrid sli. it has 4 gigs of ram already and the gpu cant be too powerful as the psu has only 1 connector.