Just curious, what do you guys sit down in front of? Windows Media Center here. Also, if you wanna show what your setup looks like/what theme you use - go ahead. Here's mine: http://www.youtube.com/watch?v=wrD8ttnVZ7k
I use Mediaportal for TV/DVR and XMBC for movies. I have a TV/movie server running a Mediaportal backend with 4 tv tuners and 5.5TB of storage. It can record 4 TV shows at once, plus stream recorded shows, movies, or music to any other computer in the house. I use the BleazleWide V8 skin on the frontend. If I were building a single seat DVR, I would use Windows Media Center because the interface is slightly better. But because it does not let you stream the live broadcasts to another computer, I switched to Mediaportal. For XBMC, I use the Aeon MQ 2 skin.