Has anyone used the HDHomerun by Silicon Dust? (http://www.silicondust.com/)
It looks like it is a great alternative to PCI/USB tuners and can be used to watch TV from anywhere in the house (even wirelessly, tho quality may be an issue with slower networks). And its dual tuner ATSC/QAM support. I have not bought one yet, but am considering it.
There is a discussion here...
http://www.avsforum.com/avs-vb/showthread.php?t=731457
or better ones at the silicon dust forum...