As you may have already guessed, the Wally would be your best bet, for the same monthly fee that you are paying now. Any Hopper will have a DVR fee. The lowest you could go with a Hopper (and still have service in two rooms) would be the Hopper Duo with a $10 per month DVR fee + a $7 per month Joey fee. A ViP722k would serve both rooms with no additional receiver fee, but it has a $15 per month DVR fee, and your second room would only get a standard-def picture. The Wally blows all of the other options away, price-wise.
Since you currently have both a ViP211k and a Wally, perhaps you can help settle a debate here. If you take the hard drive from one receiver and move it to the other one, do you still have access to those recordings on the other receiver, or does it prompt you that it needs to reformat the hard drive? (If it prompts you to reformat, don't do that, since that would erase all of the recordings.)