Best sounding LP's

Deutche Gramaphone are far not the best sounding ones.
Angel are a-bit better.
Among the classical ones the best ones probably RCA Victor.
Despite that Angel has the best musicians and performances recorded.
For jazz and rock I prefere German issues over US ones.

http://www.high-endaudio.com/supreme.html
For classical LP that would be a good start

BTW, take a look at classicrecords.com
Most of their reissues are great.

If sound quality is paramount for you, in classical LP's I have generally found Phillips to have excellent quality and some good recording artists as well. DG is touch and go. EMI, London, Decca also have excellent recording practices and the surfaces of all of these were usually quite good (when new). Angel & RCA have some good music but a lot had pressing problems. RCA Living Stereo however could be just outstanding, as could Mercury Living Presence. You can also find great LP's by Telarc. For CD's you usually get good sound from London/Decca, EMI, Chandos, Telarc, BIS, Hyperion, Harmunia Mundi, Delos, Dorian, Denon, but watch out on DG these have similar problems to a lot of their LP's. CBS (Sony) and RCA as well. On the major labels the music recorded in the last 10 years usually sounds very respectible. Enjoy.......

That is the burning question. Unfortunately, many "audiophile" recordings that can make your LP system shine, are mediocre performances of questionable works. You can't go wrong getting your hands on some of the Mercury Living Presence recordings done by Bob Fine and Wilma Cozart. There is a reissue of Respighi's "Ancient Airs and Dances" on Mercury that is very good. There is a very complete catalog of 180g vinyl available from Acoustic Sounds http://www.acousticsounds.com as well as Music Direct http://www.amusicdirect.com These folks get you the best of both worlds: recordings you know and like, reissued in high quality heavy vinyl. I just purchased Crosby, Stills, and Nash's 1st album from them pressed on 180g vinyl and it sounds very good indeed.