If you don't already own this recording or this music, the hybrid SACD
seems a good place to start.
The recording is also available on a hybrid SACD
in multichannel surround, however, and for those of you with the appropriate playback equipment, it should improve the sound.
The five versions include the standard USA budget copy, a British pressing on the Eagle label, the hybrid SACD
version released by RCA Hong Kong, the 2-CD set from RCA Germany (which is one of only two digital versions of the complete concert that I know of) and the Classic Records gold CD release (the other complete concert version) that has been out of print for several years.
Dorati's complete Firebird ballet on this hybrid SACD
from Mercury is self-recommending.