Power amplifier advice?

Another two cents from the peanut gallery:

Twenty five hundred is a very tight budget for a quality true 200-watt into 8 Ohm amp (even used); tighter still for an amp/pre-amp combo.  Your goal would be more achievable sticking with a quality integrated power source.

Those are nice speakers.  However, they are a 6 Ohm nominal load design.  With your present amp, which is very nice, by the way, and bench tests closer to 97 watts into 8 Ohms, you'd get the oomph you're after with quality 8 Ohm nominal design speakers.

Regardless of what you upgrade first, if your aim is to invest in a quality 200-watt power source, investing in one that has a great power supply (i.e.  current; not watts), one that doubles its watt output from 8 Ohms to 4 Ohms is what I would look for.  This will provide greater speaker upgrade flexibility in the future.

If the upgrade bug has you and that twenty five hundred is burning a hole in your pocket, I have to agree with the speakers first crowd.  That twenty five hundred on quality 8 Ohm nominal load speakers would get you more bang for your greenbacks and the oomph you're after.  If you decide to go that way, I would recommend auditioning stuff like:  Revel; Monitor Audio; Focal, JBL, just to name a few.

Good Luck!

Hello @kaj.  This is what I experienced with my NHT 2.5i’s when I had them.  Tried the Parasound A21 (not the + version) and it was complete overkill.  More suitable for the NHTs was the Acurus A150 at 150WPC.  Im sure you can find a great deal on it somewhere if your heart is set on keeping the NHTs.   And yes, those things play loud as hell!!!  Good luck on your search! 

I always recommend trying multiple amplifiers with the speakers to find the best match for YOU.  I went through 9 amplifiers before I settled on a used Pass Labs Xa30.8.  It is insanely good.  In your price range I really like Primare gear.  I have an odyssey kismet but the thing is too noisy.  On first boot up it buzzes and then only gets a little better after running in.  As soon as I play music the buzzing starts again albeit at a lower volume.  Tried to troubleshoot with Klaus and just never was satisfied.  But for the quality of sound I had to go up to Pass Labs to handily beat the sound of the kismet.  But that noise was too much for me

First get speakers you love, then get amps that make them happy.

Discussing amps in a vacuum is nonsense. What matters most when choosing an amp is, is it a good match for your speakers?

second the recommendation for odyssey amps for high value high sonic quality good build quality

a hegel h20 would also be a good choice they sometimes appear used under 3 grand, exceptionally clean sounding and capable amplifier