I'm pretty much there at endgame with my 'vintage' system:
Radio Tuner: 1977 Marantz Model 2100 AM / FM Stereo Tuner
Preamplifier: 1968 Dynaco Model PAS-3X Tube Preamp
Amplifier: (2) 1975 MacIntosh Model MC2100 (210 wpc running as monoblocks)
Equalizer: 1976 BSR F Model FEW-III 12 - Band Analog
Scope: 1973 Panasonic Model SH-3434 Stereo / Quadrophonic Frequency Analyzer
Turntable: 1981 Technics Model SL-6 Direct Drive Linear Tracking
CD: 1990 Sony 5-DIsc Digital Media Player Model F- 787
RtR: 1975 Akai Model GX - 265D Reel Tape Play / Record Deck
8TR: 1974 Pioneer Model HR-100 8- Track Play / Record Deck
CSS: 1977 Teac Model A-400 Vertical Cassette Play / Record Deck
Speakers: 1970 Sansui Model SP-5500
All pieces have been fully restored. Cosmetically, all are near mint condition. Sonically, very very nice - surprisingly so, especially to those more into the modern era equipment (Biggest surprises are the 8-track and the speakers; most people have never heard a quality 8TR deck and think all Sansui speakers are 'Kabuki' junk - and have never even heard of these rather rare 109 pound, Japan-only speakers...)
I have gotten to the point (after trying out a total of 17 different pairs of speakers in my listening room; plus various tubes in the preamp and various cables / interconnects and power supplies throughout) where I don't see any noticeable improvements anymore. At least not within the confines of my tolerances for cost, etc. And I have thousands of hours worth of vinyl, tapes, CDs, etc. to provide a good variety of enjoyable music.
It's actually a great place to be. Very nice not to be continually chasing down 'something better'... and just enjoying the fruits of my labor. Plus, there are added side benefits that this particular niche of the hobby provides. It's the single biggest draw / conversation starter in my home (even beats out my saltwater coral reef tank on the opposite end of the room); Older visitors marvel at the tech they actually remember from their youth; younger guests are blown away by the nuanced full-spectrum sound of quality analog medium, and all that polished aluminum, chrome, bouncing VU meters; when their only reference points are usually phone earbuds or TV sound bars...
For me, I just enjoy putting on a few LPs or tapes, etc. and sitting right in the 'sweet spot' and letting the music take me away...