Using streaming as a main source ---DSD, FLAC, MQA Streamers and DACS

You are way over thinking this. Buy the best your budget can get then sit back and enjoy the music. My dac (dad) can play all The formats. Yes some sound better but none sound bad. Even logging in to a radio station web site and playing from there sounds good. 

Buying used can be your friend as you can turn around and sell it for not much loss as long as you buy well.  Here is a very good streamer and excellent DAC that together would come in well under $7k — just one example. 
https://www.usaudiomart.com/details/649930214-innuos-zen-3-1tb-black/

https://www.usaudiomart.com/details/649931645-denafrips-terminator-ii-12th-black-full-warranty-free-ship-mint-1010-just-received-it-brand-new/

Best of luck.

MQA is much more popular than these forums would indicate because of some very outspoken people. Not everyone hates it, but the haters have an obsession to make sure everyone in the world understand how bad it is.

MQA was invented as a way to reduce the file size with ostensibly less loss of audio quality compared to MP3 and other lossy formats. MQA is still a lossy format -- they've intentionally tossed part of the music data to reduce file size.

That was probably a great idea back when they came up with it as internet service for most people back then had lower speed limits and many users had to deal with monthly data caps.  That's has ceased to be a problem for many people -- I'm sitting here with 1 GB service and no data caps and even the cheap plans often have speeds of 100 MB or more.  So, MQA is now addressing a non-existent problem.

If I can have an unaltered, lossless version of a music file, why would I want a lossy version to solve a problem that doesn't exist?

Another POV: start off simple (with a 30-day return policy for each component) and see if it feels as though you need more.

In my case, I’d had an older Bluesound Node and got on the waiting list for the newest one; so I received it quite a while ago. It sounded better in my system (Meridian) so I went along with it. I control everything via PC (don’t like the limited layouts on cell/tablet - and Bluesound is notorious for a lousy interface). Then after playing a CD directly into the Meridian system I realized there was something missing (I was running analog out of the Node). I looked into it and found there were many complaints - that there’s someone in Poland selling a mod to convert the power circuitry in the Node, and that it made a negligible different when using the digital output; the Node was killing the analog out. So I picked up a Topping E50 as an experiment for the analog output, and never looked back. I ultimately ended up with a Zen streamer out to their DAC (but am feeling that the Topping resolves more to my liking, and will start listening tests soon ... but both of those DACs will handle all of the elements you listed in your post).

I’m using Qobuz with Roon on my PC, out over ethernet to Zen streamer and DAC (USB connect from streamer to DAC; AFAIK that’s the only way to get the higher rez w/o integrating the two in one unit). I’ve tried MQA on Qobuz and have no problems with it; I generally wouldn’t nit pick and Qobuz doesn’t have much MQA anyway (when I asked them how I could find more MQA content, the respondent didn’t even know they had any) - but it wouldn’t be an issue for me (in this case I’m a glass half full guy) and I’m not one to join in on all the mental chaos; to me it’s pointless if you can enjoy the music

Summary: go lighter up front (w/cautionary re: Bluesound Node) with return options on gear; you might be surprised by how good some of the newer gear from the far east can be - and that "lower end" will just get better and better over time, most likely with a much better perfomance:price ratio.