When I was in the Toledo, OH market I was using a SuperDISH to do 110/119/121, with 121 containing my locals.
When I wanted to upgrade to HD, I eBay'ed an 811, and then I pointed an old single dish at 61.5. I disconnected the 121 feed from the DP34 switch and replaced it with 61.5. I lost my locals, but it didn't matter because I was picking these up OTA.
If you decide to just buy a 211 and want to go the DIY route, it's not that hard to do what I did if you don't mind loosing locals. You could also replace the switch with one that has 4 inputs to get all 4.
Or, just call DISH and let them do it.
