Some of the deficiencies of console digital pianos are eliminated in the mini-grand digitals. In particular, the mini-grands have MUCH better sound systems. If found the Roland RG-1 to be excellent ... but too expensive for me. It was $7000 "straight-up", but I'd was convinced I could negotiate a deal at $5000.
That's still too much for me, and too much for the poster, who stands firm at $4000.
I'm afraid there's nothing that I know of that's available for $4000. Well maybe... just maybe a CLP265. But it's not worth the money. It's just a mini-grand cabinet wrapped around a bottom-of-the-line Clavinova. I'd stay away from that one.
The CLP-295 is (reportedly) much better. But not available for $4000.
Maybe you can find something used?