Below is a to a discussion which contains some ideas on PVR choices or lack thereof, it also discusses Tivo shafting Mac users too:
If you aren't a media junkie too you make think this is a little off topic.

http://www.pvrblog.com/pvr/2005/04/tivo_cfo_no_tiv.html

"Anybody looking for another solution as a PVR should seriously consider an EyeTV unit combined with their Mac or a new MacMini."

After much browsing lately I feel at the moment there is no simple yet well equipped PVR solution around, yet.
PC or Mac, off-the-shelf or custom built.
Plenty of great partial systems but no true PVR, the way I want it to be that is.
A complete media centre with me in charge of content.
From the article above it sounds like the party is winding down at Tivo too.

The thing with Mac based solutions is the desire to dedicate a computer to the job of PVR. I just don't see Macs that way and nor do people selling them and the price reflects this. Too good to tie down that way.

The main issue with PC hardware however is windoze.
If PC hardware can be dedicated to something else more singular, like a Linux server or a PVR, it can be a comparative bargain compared to consumer products promising similar functionality, like Windows Server 2003 or Set Top Boxes.

Well I guess those PC parts on my shelves will have to be patient for a while yet.

All this wont help much if I cant improve my reception anyway!

Have fun
Paul