I think I may be having a difficult time understanding the connection chain with what you're describing. If I were to go with a stereo receiver - since they typically don't have any RC software - I would be looking for something that I could take some measurements with REW on my Mac Mini, apply whatever EQ filters I need to apply, and upload that information without requiring my Mac to be connected to my HT. What you're describing with DLBC makes it seem like you need to have a computer somewhere in the chain to get any kind of DSP for the system, which I cannot do. The NAD C3050 might fit that bill since it does have Dirac, but I would be unsure how to get all of my source devices to fit (my TV only has so many HDMI ports).
The prices of things do tend to bounce around based on demand, so it could be they had a bunch of people place some orders for it, and Amazon bumped up the price based on the demand.
I have been using my two channel systems on my notebook windows pc for a few years and have no intention to go back to anything else at this point. And again, I have already paid for the DL and BC licenses. My only issue is that without a sub in that room DL couldn't fix the bass well. Cost is $729 for the two channel version.
You can do a 14 day free trial, you may like it:
It works like this:
1) Install Dirac on a windows or Mac PC, I used my MacBook Pro, a windows desktop and a tiny windows notebook.
Dirac Live Room Correction Suite – Dirac
Dirac Live Room Correction Suite features patented algorithms to digitally reduce the room impacts and enhance the accuracy of sound reproduction, from timing and frequency...
www.dirac.com
3) Do the calibration just like you would on any device such as an AVR, minidsp flex etc., except in this case you will run it on the PC.
4) Once complete, the filters will be on the DL processor and from that point on, any music you play from the windows (or MacOS) PC will have the correction of DLBC.
So really the only difference is, instead of running DLBC on an AV device, it runs on the PC, that's all. You may not like using a PC with music listening but a lot of people like it. I don't particular like it until I try either, now most of the time I listen to two channel music on my PC running DL and JRiver.