You've mentioned some good LP labels. As you continue to look for old LP's in good condition, keep your eyes open for releases on the Hungaraton, Lyrita, and BIS labels. There were many fine releases on these labels. (Hungaraton was sort of the sister label to Supraphon. Hungaraton was the state-sponsored label in Hungary, and Supraphon was the comparable label in Czechoslovakia -- both prior to the collapse of the Soviet Union. Based on my own experiences, I think the Hugaraton releases were generally superior to those on Supraphon.)
You will probably find the quality (both performances and pressing quality) varies quite a bit on the Melodiya label, so don't pay much for their LP's unless you have heard them first.
You may also encounter LP boxed sets that were released under the "Connoisseur Recordings" label -- there were some excellent performances which are well worth owning.
You will probably find the quality (both performances and pressing quality) varies quite a bit on the Melodiya label, so don't pay much for their LP's unless you have heard them first.
You may also encounter LP boxed sets that were released under the "Connoisseur Recordings" label -- there were some excellent performances which are well worth owning.