Looks like you are looking for a I7-860 or other first gen I series. I think it's an 1156 pin. If you go that route. Ebay has quite a few in the sub ~$50 range and the video card looks like a pci-e 2.0 so an AMD 6000 series or intel 9000 series would be the maximum usable cards. Check reddit for  r/buildapcsales I snagged a 2gb 1050 for $75 shipped from evga b-stock a few days ago which is backwards compatible with 2.0.