$35000 to $40,000. speakers what would you buy and why?

You have an impressive list under consideration.  However, I do not see some models coming in at your budget preowned, even if you can find them available.  For example the M-Project and Alumine are special order listing at around $140k depending on finish.  At 40% to 50% retail preowned, that’s $56k to $70k, above your $40k budget limit.  The Homage may come in within budget.  I am a Vivid fan, and the Giya G2 will also come in budget, but you have to like the eccentric aesthetic, which I do.  
 

You have impressive, end game electronics and your current speakers are not in the same sound quality class.  From your choice of electronics I would assume you prefer a warmer, rounder, emotional presentation over clarity, transient speed, and detail.  You need to choose a direction.  Do you want a speaker that will be synergistic with your electronics that will reinforce the warmth and romance of your electronics or that will bring an added degree of clarity, and increased leading edge transient edge? To my ears, and you need to audition yourself, if the former is sought, go with Sonus Farber, Rockport, or Magico M3.  If the latter is sought, go with the Magico M Project, Stenheim, or Vivid (the Vivid would be the most three dimensional of the list but focuses on clarity, transient speed, and dynamics). So you can understand my perspective, I error on the side of clarity, detail, and transient speed.  Therefore, I would go with Vivid or Stenheim.  If your prefer the warmer side of reality, with your electronics I would go with Rockport as the best choice.  Please audition for your ears may be different from mine.  

I agree you should listen to as many speakers as you can. speakers, more than electronics, will show their personality even in a different system. You have a great list, but some very different personalities. I have the most experience with Magico and Sonus Faber. Magico will be fast and transparent and considering your electronics might get close to your target. I've owned two sets of SFs and they are musical, easy to listen too, but can be a little slow and soft in the bass. They are beautiful audio furniture. Of the two and based on your electronics and stated target, I'd try Magico first. I have less experience with Rockport so my opinion has less basis for these, but I think Rockports excel at midrange, do everything well, and pair well with a wide range of electronics. If you are not going to audition speakers, likely the safest choice.

B&W 801 D4

Powered Vandersteens.

I love my B&W 803 D3, but they absolutely require subs, which I have, hence the Vandy recommendation. Plus, Vandy's image and soundstage like your Maggies, which is to say, they sound beautiful.

I like the idea of best in show gear, assuming it is in the price range.  I live 4 1/2 hours from the nearest stereo shop, and that could be like calling Best Buy a boutique stereo shop..  you get the idea.  
I based my decision on what Abbey Road used, bought B+W 802 ( D2 ) and have enjoyed them for over a decade.