I just got in my Hauppauge HD PVR (http://www.hauppauge.com/site/products/data_hdpvr.html
). Cool box! It has component inputs, which allows you to connect to your set tob box (after the STB descrambles the signal). It generates MPEG4 output files, which is fine with me - TMPGenc DVD Author 3 reads them just fine.
So far, the quality of the output is almost as clear as the direct transport stream capture method (my HDHomeRun uses this method). The HDHomeRun works great for all clearQAM channels, but the encrypted ones were a problem. Now using the HD PRV box I can record Showtime HD and many more. My only other wish is that Verizon will increase the number of HD channels on Fios soon!