These are replacing. When I'm done, they'll be the only 4 receivers on my account. Would my account still be flagged as unsupported then?
From everything I have seen without placing an MRV upgrade order requires an unsupported flag. I would call them and see what they would be willing to do for you. The price for the 3 items you would need would be 63.97 before shipping. If you can get the MRV part for that or less then you would have a better account. If I were shelling out close to a grand for specific equipment I would spend the extra $150 to ensure I had the best chance to get the same thing again. Imagine getting a DOA and being shipped an HR20-23 as a replacement before you even got to use that HR24. I'd be pissed but that's me. Now this still isn't a guarantee but from everything that's been stated so far priority seems to be given to those with supported MRV accounts.