Non-fatiguing speakers in $10K range?

Vandersteen Treo. Beautiful build quality and design, very natural without harshness. Haven't heard em, but wonder how PS Audio FR 10's would hold up to your needs. They're on a significant sale right now.

I have the Harbeth C7ES-XD. For Classical, Jazz and Pop they are wonderful. 
I found in my room they have plenty of deep tight bass. I actually sold my two REL T/5X subs. I’ve listen to the 30s and the 5+ and liked the C7s the best. They have the most open airy sound of the bunch but all Harbeths are extremely fatigue free and scale up the better the down stream equipment. Wonderful midrange and smooth highs. Vocals are life like. I love British speakers and have owned Quad, Kef,  B&W and ATC. Harbeth to me are best and most fatigue free. 

Now, music-wise I do not listen to jazz or classical or vocals, sorry. Classic rock, hard rock, 80s new wave, punk, pop (classic and modern) and African blues like Tinariwen. People tend to insta-suggest forward sounding speakers - you like metal, right???. But I don’t like piercing sound and I rarely go to concerts exactly because of this. I listen to AC/DC but NOT at ’realistic’ revels. I like rhythm, melody, but I don’t care about 120 Db.

Considering your tastes in music, you shouldn’t be taking any speaker advice from guys who listen to female vocals/Diana Krall @ 60 db... Metal/Hard Rock are harder genres to obtain a high fidelity listening experience with choice of gear. As a long time fan of hard rock & metal myself, it took me a while to get that sorted out. Guys who know nothing about such genres are the ones who come up with Klipsch, etc. The latter is a lousy speaker for metal, in reality.

If you want your hard rock and metal to be "high fidelity" (and also do justice to your 80s new wave and pop)... a couple of speakers that are above your budget comes to mind.... But, not to fret, you probably won’t be able to beat the GR Research "Bully" for your money. If you are not a DIY guy (it is cheaper if you can DIY the kit), it appears that you can obtain a finished Bully from GR research for 5k to 6k now with the finish of your choice, i.e. 4k under your budget. Good luck with your search...

Tannoy Gold Reference series, the best you can buy for 10k and Accuphase is a renoun classic pairing.

Give Paradigm Founders series a look. I recently went on an exhaustive speaker search. I listened to B&W 702s side by side to a pair of Founders 100Fs. I had in my my that I was going to buy the B&W s but the Paradigms were much better in my opinion. Alot less bright. Better low end. I wasn't looking at Founders at the time, they just happened to be at the dealer I went to to check out the B&Ws. I then thought I better do some more looking. I checked out sonus faber, dali, kef, etc in the 7k price range at different dealers. I brought home a pair of golden ear triton 1s that were on clearance. They were nice but a bit bright to me.  I too listen mainly to classic rock and metal.  I delve into rap, jazz and about anything else on occasion so I like bass to be solid, smooth mids and not too bright highs. I ended up with the Paradigm 100f s, which I quickly traded in when the Paradigm 120Hs were marked down 15 or 20 % around new years. I got them for about 7.5k.  They now retail around 10. They  are amazing.  Check out there specs.  Solid build. Made in Canada.  They have 3-8" active woofers each. 1000w internal amps. And have ARC room correction. Which did wonders for my less than perfect room. They fill a large room nicely. Sound good wherever you sit.  My chair is obviously the sweet spot but I find that off axis listening is good too. Paradigm also has the Pesrona series which look better and  cost more. I have not heard them though.  Anyway....worth a look. Good luck!