Can anyone give me rough estimates on what it would cost to run a cable modem, router, one PC 24x7? The PC is the bottom one in my sig...2 HDDS, one optical drive. I will have a monitor connected to it, but only powered on when in use. I'd like it to be my domain controller, so I am wanting to let it run 24x7. Any rough ideas for the three? The router is a standard Linksys 4 port w/ wireless.