If you can find a good high-efficiency speaker and a decent tube integrated amp for under $1K, that would certainly be an interesting possibility. The most dynamic setup I have ever heard was a horn speaker (about 103 dB efficient) and a hand-built tube amp rated at about 6 watts. I have never heard better reproduced piano... a key test for dynamics (sorry).
I think it would be hard to get this kind of setup for a grand but go for it if you can.
I think it would be hard to get this kind of setup for a grand but go for it if you can.