Well, I finally went ahead an purchased another MediaMVP. The intention is to have two MythTV stations hooked up - the existing on in the bedroom and now one in the greatroom.
Interesting thing is that Hauppauge updated to device. That's the good news.
The bad news is that the MediaMVP Media Center project has to extend their software to handle the booting. You see, my prior device booted via (what must be) mostly standard TFTP boot sequence. The new device doesn't. There's been some discussions about the revision just before mine, but nothing around mine. (I've got an H2 while the conversation was around the H1.)
Anyway, I chimed in and offered to act as a tester and general guinea pig. Not like I can do much else when it's network related! :-/