I'm waiting for a dual tuner HD DVR or Tivo, plain and simple. Will I go with the 921 when it comes out? Doubtful. With the way Dish is handling the 721, and using the same code base for the 921, it really worries me that the 921 will suffer the same fate, being a piece of crap.
Don't get me wrong. I can't live without my 721. It sucks when there are only so many satellite companies out there, offering only so much. And either choice sucks. Which is worse? DirecTV sucks for their service and support. But Dish does too. The "advanced" tech support folks at Dish, at least 66% of the time, are outright clueless.
I could tolerate a DVR or PVR like the 721, even without name based recording, and without some bug fixes, if Dish would take the time to hire and train people with a brain. AND if they communicated with their customers, fessing up to the fact that they know they have problems. Is that going to happen? Unfortunately not. It's just a matter of deciding who of the service providers is of the lesser evil.