I currently have the following receivers: D10 R15-100 HR21-100 H21-100 I am planning on moving the R15-100 in place of the D10, and adding a new HD DVR. I'd also like to add multi-room viewing (I understand that would only work between the HD receivers). I currently have only one input to the HR21-100. I understand that I will be re-upping for another 2 years when I make these changes. If I am going to make the change - can I ensure I also get upgraded to SWM for the HR21 location - since I only have one line at that location? Would the HR21 also need to be upgraded? What should I expect in terms of cost? Thanks for any advice - I appreciate it!