I have had a Steinway M for 30 years, 1925 vintage. A fine, very playable instrument still, it could use new strings and hammers--a few scratches on the case, etc...a competent specialist wants to re-build it for $17,000, case, new Steinway parts everywhere, new strings, polish soundboard, eleven tunings, etc...I would get essentially a new M, with old-growth spruce soundboard, and original ivories and ebonies to boot.
I might do it. Trouble is, with a rebuild, you never know exactly what it will sound like, until you commit, pay the money, wait for the work to be done, and try it. And there are limits to a 5'7" piano, limits imposed by the physics of overtones.
I see the attraction of a new instrument...I played a new B at Steinway hall in NYC a few years back, gorgeous instrument, every nuance there, did exactly what I asked and more. Only 81K!
$=work=time-spent-not-playing-the-piano/less $=less piano=less nuance=less bliss
A difficult equation to master.
Good luck!