Project #1 Building my own PVR

So, I've had this project in my head for a while.

This will achieve a few goals:
1) My wife has demanded we get a Tivo in order to save time in our lives and to not be ruled by the networks' schedules. I'm cheap and think I can do it for less material cost (not factoring in the possibility of this becoming a time-sink, of course)
2) I want to reconnect with the digital media technology space after living in the email and spam space for the last three years. What better way to see the current features and challenges than to try and build first-hand?
3) I need a linux project. I've been working almost exclusively in the windows environment for almost 10 years now, by necessity, not by choice. the nerd in me secretly yearns for the good old UNIX and X-windows days. This is a good forcing function to finally install and use linux.

So here is the first decision: Do I build a Freevo or MythTV system?