That's an impressive setup! I decided to go an easier way, with a subscription to TV Torrents and a copy of Automatic. When a download finishes it gets copied to a LinkStation NAS, and Media Center Master cleans up the file names, downloads metadata and artwork, and organizes everything into the right folders. We can watch it with whatever software but use Windows 7MC on a Mac Mini most of the time.

This way we get HD versions of everything and don't have to worry about messing with another machine.