Well, just had a service call at the local HDTV dealer, he confirmed that Mits and RCA will have a DSS/HDTV combo box that will work with any set as long as it's HDTV compatible (high freq horiz scan) and has RGB component inputs. Supposedly they're under $1000, available in our area (northwest) in a few weeks to few months. Don't know if they have VHF/UHF tuners built in or not (so you don't have to switch back and forth between inputs and decoder). One of the downers is if you have the early HDTV sets by Mitsu with no RGB inputs, (just a DB15 connector), you'll have to use their decoder box, but it is scheduled to have a new one for under 1K, but it's not going to have a DSS built in. Sounds idiotic, I know, but I gave up trying to figure out the why of the industry years ago. And don't be surprised if this changes in the next 4 nanoseconds...
Again, a little purchasing patience will pay dividends in many ways.