What amp is best with Wilson Sasha DAW speakers

not at all. i think you should audition both, and decide if the differences which may (or may not) favor tubes are such that its worth the additional hassle that WILL come with dealing with tubes (particularly tube amps; preamps are low maintenance).

no one ever truly owns a tube amp; they just rent them.

i did that calculus and went to Luxman and have zero regrets, having used it with Sasha 2s and now Magico S7s.

but a good move: go same brand for both pre and amp; the amp / speaker interface is most important, but a manufacturer will always say their gear is synergistic. and they're usually right. 

Lol!! I love the part about never owning the tube amp. I guess you’re never done paying for it,  with the future need for tube replacement. Thanks fo your input and with try to locate a Luxman dealer near me. 

You'll not regret checking into Luxman.  It has it all.  

Regarding tubes being better for a transparent speaker, I think lots of contemporary high end tube gear has been made to approach solid state in terms of transparency...especially ARC. 

One the preamp, VTL 7.5 III, Ref 10, and GAT 2 would without doubt all be excellent, but for me the GAT 2 drops out due to being single ended only, and the Ref 10 get canned based on its impedance requirements which mean you can't drive a subwoofer.  

VTL emerges as the top choice among those IMO.

@carey1110

I once had a pair of big Wilson Alexx driven by 2 pairs of D’Agostino Momentum M400 monoblock amps with the ARC (Audio Research) Ref 10 linestage preamp and achieved excellent results. At the time I was using all Transparent Opus cablings, Kronos Pro turntable w/ 12" Black Beauty tonearm, Air Tight PC-1 Supreme mc cartridge & D’Agostino Momentum phonostage pre served as analog front end source components and the DCS Vivaldi full four stacks (Vivaldi masterclock, Vivaldi upsampler, Vivaldi DAC, Vivaldi CD/SACD transport) served as digital front end source components.

I highly recommend the ARC Ref 10 linestage preamp paired with either the D’Agostino Momentum M400 monoblock amps or the ARC Ref monoblock amps for your Wilson Sasha DAW speakers. For digital front end source component(s) I highly recommend the latest EMM Labs DAC or its CD player. ARC & D’Agostino gears pair really well with Wilson Audio speakers combined with Transparent cablings. Ayre, Vitus Audio, VTL, VAC, Luxman, higher end Naim 500 series separate gears will also pair well with your Wilson Sasha DAW.

Remember, your front end source components, whether digital or/and analog front end components, are the most important components in hifi chain.

The Naim 500 series separate gears will also pair well with your Sasha DAW. The Naim 500 series separate gears comprise of the following :
* Naim ND 555 digital streamer/DAC with its external separate Naim 555 PS DR power supply unit (psu).
* Naim NAC 552 linestage preamp with its external separate 555 PS DR psu.
* Naim NAP 500 DR power amp with its separate external 555 PS DR psu.
The NAP 500 DR power amp is a true dual monoural design configurations with left & right channels are encased in separate chambers and are completely isolated and independent from each other with its own independent power supply and voltage regulations for each channel.
These Naim 500 series separates will sound highly musical on your Sasha DAW speakers.

For these Naim separate components you must use DIN connections to connect between components as it will make a big difference sonically, will sound better than using their RCA single-ended connectors. DIN is Naim’s proprietary connectors and is their XLR balanced version.

I am a big fan of Naim Audio. I’m also a fan of D’Agostino Momentum & Relentless series, ARC Reference line, Linn, T&A, Vitus Audio, Tidal, CH Precision, Accuphase, Luxman, EMM Labs, MSB, Soulution, MBL, Audionet, DarTZeel, Burmeister, Chord Electronics, Lamm, VTL, VAC, BAT, Cary Audio, Ypsilon, Ayon, Pass, Levinson, Boulder & PS Audio BHK series among others.

The OP said he cares most about highs and mids. Nothing beats electrostatics when it comes to mids and the air that huge panels can bring to the table. I’ve heard Sasha DAW and Alexia 2 at axpona and In 2 different homes and although they were great in their own right, electrostatics such as ClX art or even neoliths just demolished both Wilsons. You want accurate mids and highs ? Get the CLX. You want big huge sound with incredible dynamics? Then Buy a Neolith. I’ve yet to hear ANY panel he as dynamic as the Neolith. Most shows do a piss poor job with the Neoliths but those who have taken the time to find the perfect amp for them, never ever look back. 
If you are looking for luxman 900u, you might want to talk to Whitecamaross. He has a huge thread here  and has reviewed them extensively. He’s owned those amps like 4 times and has gone through about 300 amplifiers in total. I also believe he owned Wilson Sasha 2 and now own the Neoliths.