Since you are interested in Hungarian Dances Nos. 1-21, here is a list of other items that you may find interesting.
Fidelio (complete opera recorded in 1962)
Christa Ludwig, Jon Vickers, Gottlob Frick / Philharmonia Orchestra / Otto Klemperer
[ EMI The Opera Series / 2 CD Box Set - released 20/Nov/2009 ]
1001 Classical recordings to hear before you die (1801-1850) - "Superbly remastered. The sound has a depth, beauty and realism far beyond any previous incarnation of this splendid 1962 Kingsway Hall recording. It remains first choice." - Rosette...
GERSHWIN / GROFE / HAYDN / BEETHOVEN / STRAVINSKY / BERNSTEIN / MAHLER
This is Leonard Bernstein: His Greatest Recordings
Rudolf Serkin, Lukas Foss (pianos), Original Broadway Cast, Dietrich Fischer Dieskau (baritone) / New York Philharmonic Orchestra, Leonard Bernstein
[ Sony Classical / 16 CD Box Set - released 1/Nov/2009 ]
This special edition collects the conductor-composer's 15 most celebrated original albums from the 1950s and 60s on 16 CDs. The best selection of his benchmark recordings as a conductor, composer and pianist.