Looking to upgrade from a Intel core 2 duo 3.0 ghz machine to something like a I-5 Intel or high end AMD processor with at least 8 gigs of memory, a good power supply and mobo, a 1TB HD, and decent video card. I've seen many at different retailers advertised with specs I mentioned above, but a couple of them weren't recommended as a gaming computer? I don't have a clue, thanks for any help.