One other possibility, but it's using more equipment that is not Dishes (although actually Echostar's).
If you put a slingcatcher on each of your HDTV's (
Sling Media - SlingCatcher), you can have HD content streamed from a ViP 722. All you'd also need is a Slingbox Pro with the HD connect cable, or the Slingbox Pro HD. Besides your DVR, you can also then stream to your other HDTV's any other video device you might have in your home theater. However it'd only be 1080i or 720P sources using HD component inputs and not HDMI connections. You could also then watch it anywhere else in the "world" due to the Slingbox able to stream anywhere on the internet.
In addition, the Slingcatchers will also be able to be used with a future "Sling" version of the the Dish HD DVR. The slingbox devices will still have resale value if and when you'd upgrade to that model.
This way you have the following:
1 ViP 722 DVR (1 HD output, 1 SD output) that can support your HDTV next to the receiver and use Coax to your SD set.
1 Slingbox Pro with HD connect cable or Slingbox Pro HD.
2 Slingcatchers for the two other HDTV's.
Unlike additional Dish DVRs, you' have to face having a single HD source shared to the three HDTV's, however the SlingCatcher has a 60minute buffer so viewers at the other sets could still pause the stream up to 60 minutes while the others are still watching.
Cost'll be higher as you'd be purchasing gear that isn't part of the promotion.
Possible PRO, as the Sling HD DVR is not in production/shipping equipment, but that you'll already have the SlingCatchers to take advantage of that system. However, might DIsh "lease" slingcatchers for customers of that new DVR in the future for multi-set viewing?
It's a risk if based on the speculation of that new DVR, but is really cool if you are using it for the current technology capabilities. In addition, Sling is doing a "beta" of the Slingguide (
http://www.slingmedia.com/go/slingguide) that will even allow you to remotely control your exisiting ViP 722 receiver to setup shows to record, etc. If you have the Slingbox, you can also watch it over the internet using that website.