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
@georgehifi what would you recommend for YG Hailey 2.2s? Unfortunately not sure measurements available and they are more efficient than the Sonjas and older Haileys.
@georgehifi what would you recommend for YG Hailey 2.2s

Sorry Keith, never heard them.
Also from what I can find, no "independent load measurements" has ever been done on them to see what kind of amp would really be suitable.
They apparently dip into 3ohms, I'd like to see where? and for how long?, also if there's high negative phase angle also at that frequency, they can easily start to look like 2ohm or even 1ohm to the amp.
Safe bet to run an amp like the Gryphon Diablo into them or a cheaper Parasound Halo A21+ or Halo JC1's if you can afford them.

Cheers George 
@ smodtactical Not yet, I am buying that last. I got a new DAC, preamp, headphones, and XLR’s this month. A pair of AHB2 amps are next and then the second amp. The speakers are going to be last because I think Yamaha will release a smaller NS 4000 sometime this year. They have already released a NS 3000 monitor. A smaller speaker would work better in my room, which is smaller than yours. However, if that does not come out then I will get the NS 5000 and use the Convolution file processing on ROON that I mentioned to you before to fit the speaker in the room.

I get the AHB2 after July 15th USA tax day. The second amp I hope around September.
The NS3000 looks interesting! I bet it disappears really well and probably would be a better fit for my room as well. If you get it youll be one of the first to own it.

Have you considered the TAD CR1 ? Those looks amazing.
What a question.
 You already have 300W @8 Ohm.
which would be great w those speakers. As you will need the headroom for crescendos and power chords, song ending power chords, etc !

i would keep the minimum of 300WPC rms, for any speaker.

  The Mcintosh 500W monos, new McCormack amps , Sanders Magtech,  or maybe trade in for the 7B monos? or try the 350W Rob Carver Raven monos.  Btw, those 4b’s are great amps https://www.bobcarvercorp.com/crimson-raven