[Wlug] Mythtv Hardware

Hello all, I'd like to know what Wlug'ers are recommending for mythtv hardware these days. I already have a Hauppauge PVR-350 TV capture card. I'd like to build a low-profile quiet mythtv box that I can put next to a standard TV (not hi-def). What do people recommend? What about disk space? Ideally, I'd like something about the size of the mac-mini, but I don't think I can use a mac-mini as a mythtv backend. I already have a mythbuntu box, but it's big, noisy, and not suitable for what I'm looking for. Any ideas?? -- -Chuck