i may have just what you want. i have a motherboard onboard audio with 1.06G proccessor and 2 ram chips so no less then 256mb .and power supply make offer
also its in a small mid size metal tower that was rattle canned black and drilled vents. and a dial up modem that is 2 years old. plus generic cd burner. but you would probly want to build it along with your own parts .