Responses from tdimler

Rockport Avior 2 vs Wilson Sasha DAW
Excellent choice on the DAW.....wonderful speakers.  Any of your electronics above would be good choices...I'd go with DAG Momentum if budget allows.  VTL and ARC also good with Wilson.  Another consideration would be the superlative Luxman 900 se... 
Solid State Preamp Under $8000
You should be able to get a used Luxman C-900 U for this price.  I don't think you'll beat it with any other SS pre-amp in this pricerange.  Absolutely great piece of gear. 
Wilson Sasha Daws or Sabrinas
Definitely go with DAW if you can afford them.  Yvette a nice compromise though.  
Is now a good time to buy a pre-owned DAC?
No need to go back 3-5 have neurotic audiophiles dumping cutting edge current dacs at deep discounts all the time.   
Audirvana Plus vs Roon - High Sound Quality at Lower Cost?
I'll put in another vote for Audirvana.  I use it exclusively on a mac mini server and run it from the very good iPad app.  Mostly playing local files stored on a NAS but I do use Tidal some.  You don't have total control of A+ from the app but it... 
Mytek Manhattan
What about using an ethernet to Wi-Fi adapter on the current Manhattan II with network card? 
Interesting.  I saw him a couple months ago on and it was the single worst show of any kind that I have been a large margin.  I actually left early, along with many others.  It was just one huge garbled mess of sound...dump some forks in ... 
Your last concert was to see who and when?
Saw Joe Bonamassa last night at the Orpheum Theater in Memphis. Great show !Interesting.  Saw him last year and was the second worst show I've ever seen!  
My Long List of Amplifiers and My Personal Review of Each!
No doubt the DAG integrated is getting very close to the top but coming straight off ML website....Neolith can dip to .43 ohms so I think it is valid that they could need more power.  Boulder immediately comes to mind but I think that has already ... 
Suggestions for Solo Violin Recordings
You'll have a hard time improving on the new Bach Sonatas and Partitas by Rachel Barton Pine.   
What’s a 10k to 15k speaker from smaller company that performs well?
Another vote for Sanders.  Also look at Joseph Audio.  
Integrated Amp Recommendation
Go for a Musical Fidelity M6si.  Had one for a couple years and thought it was a really great integrated for the money. 
Audioquest 5000 or ???
AQ Niagara 5000 and forget about it. 
My Long List of Amplifiers and My Personal Review of Each!
I don’t think I’ll be getting alexia 1 unless I find a deal that has never been seen online before. Agree with you here.  The market is awash with Alexia 1....could be a major problem if you overpay. 
Your last concert was to see who and when?
Bob Dylan this past week in Midland, TX.  Hands down the worst show I've ever been to.  Walked out part way through.