I'd like to build an inexpensive MythTV system with an old Pentium 4, 1.8 GHz as the backend. It will record OTA HDTV (perhaps from the HD Homerun), remove commercials, rip DVDs, etc. I'll administer it and schedule recordings through the frontend running on an old laptop. To watch recorded content and DVD ISOs, I'm considering using the Asus O!Play HDP-R1 via UPnP.
I'd appreciate your thoughts and comments on running such a setup.