My most valuable are certainly not my most played, eg a UHQR Tea for the Tillerman, which I have owned since new- I think the old Island pink label I bought off the street for a buck actually sounds better.
Other goodies- Direct to Disc Flamenco Fever :)
Mobile Fidelities like DArk Side and Aqualung
Some valuable pressings off of 'Harry's List,' including some the big Mercurys, RCA's etc.
The best sounding of the bunch of vintage classical are probably the Deccas, some of the Londons, and the Lyritas, of which I have quite a few;
I still have almost all of the records I bought as a teenager, believe it or not- some of them are still in very good condition, but I have them more for nostalgia than playing-
many, many audiophile collectible records from the early seventies and eighties, including Nautilus, M & K, 1/2 Speed Masters, MoFi, Mark Levinson, lots of Japanese pressings, Sheffield, etc.
I really need to organize all this vinyl- I think I'm close to 8,000, maybe more-
Oh, yeah, I found some of Fulton's demo records in a pile not long ago.
And, that Billy Holliday singing at Altamont Airport where you can hear the planes taking off and landing while she is on stage.
I could go on....