D* can't do that either can it? I'm pretty sure the 921 is the first such receiver that was integrated with any content provider. Tivo standalone can but I'd be surprised if D* added an OTA tuner along with the SAT tuner.
In any case, stay with D* if you like it better just remember you'll be paying more for less but you may not have as many bugs to deal with or you may get lucky and not have much problem at all.
The only thing to keep in mind is that the first line tech support is pretty useless, I doubt any of them have even used the system, they probably just search a knowledgebase. typical of most techy companies. If D* offers better service and you aren't willing to keep asking until you find someone knowledgeable with Dish then you might be better off staying with D*.