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.
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.