HDTV reception and network streaming in a box

I have been a TiVo owner since almost day one; seven years with a Series 1 box. But TiVo's elimination of lifetime subscriptions has made me plan on migrating to a do-it-yourself DVR, probably running MythTV. As I spec out hardware, I am increasingly frustrated at the paucity of PCI slots bestowed on us by motherboard makers today. I want good sound, good NTSC, FM, and HDTV, and hopefully multiple tuners, but there is scarcely a mobo in sight that has that much room in the interior. However, I found an alternative in Silicondust's HDHomeRun, a standalone, dual-tuner HDTV receiver that streams video over the network, and supports Linux right out of the box.