1. I agree that it is more difficult to find NM jazz and rock used LPs. People played these LPs a lot; often drunk, high or both ;-) Through trial and error I've found a few reliable sellers on Ebay. Your experience with used classical is similar to mine. Box sets/operas are often unplayed and excellent sounding.
3. Perhaps our difference of opinion regarding Verve recordings is attributable to the differences between the originals versus reissues/tape. The 45 rpm reissue of "Gerry Mulligan Meets Ben Webster" is fabulous and one of my favorites.
4. Agreed. The Benny Carter "Jazz Giant" is terrific. I also like Carter's "Swingin' the '20's". Keep an eye out for the Art Pepper's "Smack Up" and "Gettin' Together", Leroy Vinnegar "Walkin'", Barney Kessel/Ray Brown/Shelley Manne "The Poll Winners" and Teddy Edwards "Teddy's Ready".
5. Thanks. I'll look for the JJ and Kai
7. Sadly I agree. I can only recommend one OJC: Tommy Flanagan and John Coltrane "The Cats"
I'm a neophyte with classical labels and haven't found a rhyme or reason with respect to labels other than the grey Columbia 6 eyes generally sound good. Maybe just a lack of experience on my part, but I've had mixed results with RCA, Mercury and Angel.
Can you offer any further insights?