A few weeks into the HD100/no-HTPC, and life is settling in. I had to tweak the CQC IR-receipt logic to be a little tighter when it receives the MX850 signal, so the remote is a little more intelligent about being context-sensitive.
1) One of the RAID5 disks died, I didn't notice for a few days and couldn't figure out why SageTV-live TV or recent recordings weren't working. Once I noticed the tiny little system tray icon that said "raid error", I got another disk and let the array rebuild itself. Damn well took 28 hours, but it's now fine.
2) I'm debating my "use a megachanger for rarely watched DVDs" as it is a little PITA to turn on the touchpanel just to select a DVD. 1TB hard drives are getting pretty darn cheap, and I could swap out the RAID5 500GB x 3 array with a 1TB x 4 array, not increase power costs by that much (~$2/month). I would have to learn how to break the 2TB filesystem limit as that would be a 3TB array. It would also take *days* for when a disk dies, so i'd need a 2nd SageTV recording location in case that happens in the middle of a "Lost" season.
I also just got the HD-PVR installed, still need to connect it to Sage. If that works, my hard disk consumption will go through the roof as much more will be at the 10GB/hour for HD versus 2GB/hour for SD.