Fair enough.
Software makes the DVR, not hardware. MythTV and WMC are great applications that allow me to watch programs in HD or SD on any TV in my house, computers or portable players. Until there is really good software for the Mac, that is still a liability. Front Row is a good start, but it doesn’t have the recording functionality.
Blu-ray is already here for Windows. I’m not sure Apple is willing to make the compromises necessary to play back the Blu-ray DRM.
I’m not a “normal” person when it comes to computers. I tend to like cheap, single purpose machines. One box sits in the corner recording TV and serving it across the network. Another is dedicated to work. A third is for internet use.
My next project will be a hackintosh, although I may break down and buy a mini.
Apple sells a device that offers what I consider the nicest synergy of media and your compute platform - AppleTV. I just purchased one and it came with the new "Take 2" software. All I can say is - Incredible! I can rent movies on this device that I can then move to an ipod or a computer (and vice versa) to watch. I have 150Gb of 720p HD movies on my AppleTV and it is awesome. My kids favorite DVDs are digitized and I'll never have to buy another copy of "Cars" as long as I live!