Here is a chart with some of the differences between the RX-A3010 and RX-A3020:
Yamaha Aventage RX-A2020, RX-A3020 A/V Receiver Preview | Audioholics
Here is a comparison between the RX-A3030, RX-A3020, RX-A3010, and RX-A3000:
Comparison Chart:RX-A3030,RX-A3020,RX-A3010,RX-A3000 - AVENTAGE - Audio & Visual - Products - Yamaha United States
As for the Sabre vs. Burr-Brown DACs, I doubt that you would hear any difference in a level matched, double blind test.
Here is a
review of the RX-A3000:
Yamaha RX-A3000 Aventage 11.2 Networking A/V Receiver Review | Audioholics
It looks like they got the video processing right with that, so likely the RX-A3010 & RX-A3020 are quite similar in that regard, though the new RX-A3030 gives up the HQV Vida processor and uses a Yamaha chip instead, so there is no telling how it compares.
The RX-A3000 is only 9.2 channels, whereas the others are all 11.2 (with added stereo power amp).
The two newest ones have a higher level of HDMI, as they will pass and upscale 4k. And they both seem to have independent HDMI outputs, whereas the oldest two have only simultaneous HDMI outputs (all have 2 HDMI outputs).
Really, they all look great, but if they were all the same price (which they are not), I think I would want the RX-A3020 the most, as I am unsure of the video processing on the latest, and am not convinced that humans will hear the difference in the DACs in level matched, double blind listening tests.
However, there is a very good chance that most people would never actually use or need the video processing, as most sources these days seem to have a video output setting such that everything is converted to that output, rather than outputting the native format, which means one is using the video unconversion in the source rather than in the receiver (or TV). In your case, with the Oppo, it has great video upconversion, so there is no reason to not use it for all of the discs played on it and any unprocessed video that is input into it. So for you, the video upconversion is very likely to be irrelevant in the receiver.