Amp and Preamp recommendations for Yamaha NS5000


Currently have SOTM 200 ultra -> denafrips terminator +dsp board -> Audio gd he9 pre amp -> dual bryston 4bsst -> NS5000.
I am loving the sound... just sounds incredible. But wonder about amp and pre amp upgrades down the road. Any thoughts on what might work well? These speakers are 87 db efficient.
So far thinking all pass labs amps + pre.

Ok with buying used. Would like to keep things under $20k if I can. Thanks.
smodtactical
@mrdecibel .....................

”asking for a friend” was my attempt of making a joke. I never saw d2girls posts and did not realize her posts had been deleted as I wasn’t following this thread too closely.  
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He has not harassed you or anyone at all on this thread, he simply stated and questioned measurable fact about McIntosh transformer couple solid state amps.
Since when, does McIntosh have lightning fast dynamics, and a high damping factor ?
This is not harassing, even in the slightest way.
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