Good to know it’s the Luxman M900U which got the nod.
This post may not add much value to the thread. I noticed there are few comments here on the bass of the Luxman that’s lacking in comparison to other options. Although I don’t own the M900U, I do have the L-590AXII integrated and it’s currently the best sounding amp I have experienced in my system after more than 20 years in this hobby messing around with different types of amps. The bass may not be Luxman’s strong trait in terms of visceral power and slam but it’s quality bass. It may sound slightly lean or lightweight but it’s a defined, layered and textured bass with good refinement and detail. You will hear all the detail and nuanced layering in the bass if it’s in the recording instead of a "one-note" bass. The appeal or strength of the Luxman is mainly in its detailed and neutral presentation, sounding a little light on its feet with a slight hint of sweetness and warmth in the midrange and treble.
At the end of the day, the amp needs to match the speakers. Synergy is the key to great results.
Good luck.