I bought the 1885 Steinway F from Craigslist for $2200.
I bought a Microsoft Windows Surface Pro 4 for $1400.
My PNOscan II MIDI sensor rail and Stop Rail were about $1500.
I have a Steinberg UR-22 II external audio card/preamp for $149.
I added Emotiva Stealth8 monitor speakers for $749 each, plus AirMotive4 monitor speakers for about $400 for the pair. (total 4 speakers)
(so the piano was the cheap part, and it took about 6 hours to install the PNOscan MIDI rail, but about 40 hours to install the Stop Rail, because it's not compatible and I had to modify it in various ways to replace the damper spring rail, and then modify the actuator.
I'm happy, but it was a long haul.