I have a Dell Optiplex 745 Mini Tower, I've upgraded it enough to were the only thing that is the same is the motherboard. I have a 700 PSW and a Core 2 Quad in it at the moment. I'm wanting to upgrade from my old 5670 to something newer that can handle most current games on decent settings. I have $150 for a card at the moment.
Specs, http://www.dell.com/downloads/global/products/optix/en/opti_745techspecs.pdf
Specs, http://www.dell.com/downloads/global/products/optix/en/opti_745techspecs.pdf