Streamer ugrade options please

Your requirement list is long and things are looking bleak for the blu-ray market. The upcoming playstation 5 release from Sony is projected to pretty much kill the rest of the contenders in the Blu-Ray market.

Oppo would have met your needs, but, unfotunately, they are done. It was a sad day when my Oppo broke down.

Your best "audiophile" option at the moment is a Yamaha BD-A1060 blu-ray player (plays blu-ray audio, sacd 2.0/5.1, hdcd and everything else out there). It was designed to compliment their Aventage series receivers and surround preamp processors. It has balanced output stages, 2 channel out, both balanced XLR and rca analogue out, decodes all your surround formats, etc. It sounds phenomenal and gives Oppo a run for its money!

BUT, you would need a surround pre-amp processor or a receiver with 5 channel pre-outs though as it does not have a volume control or 5.1 analogue out.

You may have to move fast on this Yamaha blu-ray player because it is expected to be discontinued very soon! And then some A-hole will try to sell his used abused unit to you for 4 times more (you can see that going on with used Oppos).

The Oppo 105 is likely your best bet for functionality and cost.  There's actually a BDP-105 on audiogon now that's been modified with linear power supply and upgraded fuse.  Price is $558, which is extremely low for this item.

Otherwise, maybe Panasonic DP-UB9000 if you want something new. 

I don't know of any 5.1 streamers that have full 5.1 analog outputs.

That is a lot of requirements, and the market for high end players is shrinking.  I would rethink your needs