Best Sounding Recording

It depends on my mood. Only Kidding! Naziskinheads"Die! Die! Die! Its a sort of opera. Independent label, of course.

Stravinsky "Firebird Ballet" - 45rpm Mercury reissue from Classic Records

Lightnin' Hopkins "Goin' Away" - 45rpm reissue from Analogue Productions - let's just say this gets very high marks among a number of others
.

John Coltrane- Blue Train- Classic Records 45 RPM Series-reissue of Blue Note

Digital: Burmester Sampler Demonstration disc

I'll second Rushton's mention of the "Firebird" and add:

Mendelssohn "Mendelssohn in Scotland" 45rpm Decca reissue
from Speaker's Corner

"Autumn Yearning Fantasia" and "River Of Sorrow" FIM 002 and FIM 003 from First Impression Music

Ray Brown Trio "Soular Energy" Pure Audiophile PA-002

Count Basie Orchestra "88 Basie Street" 45rpm reissue of the Pablo 2310-901

Sorry, I couldn't stick to just one ;)

Spirit Traveler Hits from the Motor City XRCD.