Best speaker/system piano concerts

"Large Magneplanar speakers and a Pass X350.8 should give you the power and scale you seek."

     Plus one for dweller's recommendation.  You may want to audition with and without a good tube preamp to best tailor the sound to your speciific tastes.
     Both the new and used 3.x and 20.x Magnepans are excellent for life-like piano reproduction but may not produce the ultimate in powerful and dynamic bass.
     If you prefer state of the art from top to bottom, add this if you have the room:

http://www.theabsolutesound.com/articles/audiokinesis-swarm-subwoofer-system/

     With your large budget, you can afford the extra $2,500 and create a world class system.  I honestly don't know of a system that would sound better.  If I could afford it, this is definitely what I would purchase.

Best wishes,
   Tim

Any decent system will give you fine piano sound without you having to spend into the stratosphere...I'm a piano freak and enjoy a range of stuff from classical to jazz, and in my job mixing live shows I often work with a fine, recently tuned large Steinway so I know what a great piano played brilliantly sounds like. I like a full range system with subs for weight, and my current rig of Klipsch Heresy IIIs with 2 REL subs and a little single ended tube amp really delivers the goods. Save most of the 30 grand and just buy a piano.

To get  amazing  piano  sound you need get speakers with flat response as
possible in midbass region  100-350 Hz up to 500 hz  is very important
All low register is depend from this frequency , And sound is very huge
and juicy.   If you close to NY Or NJ you can listen  my Bache audio-002.
What is main difference to make piano sound is unique.   They have 
separate midbass  8" with aluminium cone,loaded oh independent
build in   amplifier and  active Linkvitz -Reily crossover 100-700 Hz     

How about speakers designed by a Piano maker: the Bosendorfer VC7

https://www.dagogo.com/bosendorfer-vc-7-floorstanding-speaker-review/

I haven't heard these models but they are well regarded for their rendition of piano. Other speakers I'd consider are the large Tannoy legacy models, Spendor Classic 100s and Harbeth M40.2s. The latter two reproduce piano much better than most speakers I've encountered. I have to disagree with the advice to avoid polypropylene. Some of the most accurate speakers I've heard use polypropylene cones. Their combination of stiffness, mass, and self-damping properties is competitive with some of the most exotic diaphragm materials. 

As for amps, I haven't heard any that produce more realistic piano tones than those from Yamaha. With your budget I'd consider the A-S3000 or A-S2100. I'm not claiming there isn't better out there, just that I haven't come across them.

Aside from the investment in the speakers and the associated gear, you need to make sure the speakers are set up properly in the room and the room acoustics are properly selected. As Wolf said, many "good" systems can reproduce the piano but in my experience, recreating the soundstage that can accurately reflect the size and the location of the piano is a bigger challenge. Furthermore, the "sound" of piano can vary significantly depending on how its recorded, live or in the studio, and more specifically where the microphone(s) are placed. You'll find on the same recording, some speakers push the piano to the back of the soundstage and others bring it to the front. With that sort of cash layout, you just need to listen to different systems and decide which one resembles the "real" sound of piano better than others, in our room and to your ears. My 2 cents.