Amp and Preamp recommendations for Yamaha NS5000

Yes the impedance curve ,phase angles and reasonably high efficiency indicate the NS5000s should be quite easy to drive .
They are nominal 6 ohm and do not dip below 3.7 ohm.Most 50 watt amps will be comfortable driving that sort of load.Not dipping below say 5 ohms would be better still but many modern speakers dip down to around 2.5 ohms which really is a tricky load. 3.7 is very benign compared to that.A lab report here where they make this sort of conclusion.The nominal 200 watt thing really means very little as it is nominal.-http://livingsoundv.wpengine.com/wp-content/uploads/2017/01/Yamaha-NS-5000-review-hfnews.pdf

My local dealer has a Musical Fidelity 800 NuVista  and willing to take my brystons in on trade. Also has new AS3200. Whats cool is hes willing to  let me test each one to see which I like more.
But my gut tells me to sell my brystons and get the pass x250.8.

So the 250.8 just sold. So gotta look at other options.

Thinking of the coda no.8 also. Also the accuphase e470 or p450

After a lot of research I am leaning towards either a Pass integrated or a 150.8 or 250.8 with my audio gd he9 preamp.
Or a luxman m900u or 509X.
A friend of mine recently listened to the NS5000 with a VTL tube pre, m5000 power amp and brikmann dac and said it sounded too smooth. I know the ns5000 is very neutral... do you think pass or luxman might be too warm overall? HE9 is likely neutral to slightly bright so may balance things but I do have a denafrips terminator so that may also push things to too warm?

Has Ayre been eliminated?
I would have thought an AX-5 Twenty would split the difference nicely.