Anything by Ricardo Morales is bound to be marvelous. My wife and I had the pleasure of listening to him live with the Philadelphia Orchestra - what marvelous tone!
Some recordings on LP that I can recommend for overall sonic excellence and good performances:
> Thea King's various recordings with the Hyperion label, consistently very well engineered sonically. Choose the music you like, if you like her playing style (which I do).
> Weber and Brahms Clarinet Quintets with Daniels and the Composers String Quartet on Reference Recordings, RR40. Or the Thea King recording of the Brahms with the Gabrielli String Quartet on Hyperion, A66107.
> Alan Hacker's "Hymn to the Sun" lp on L'Oiseau Lyre DSLO 17, with music by Birtwistle, Debussy, Monteverdi and Schumann.
> Corigliano's Concerto for Clarinet and Orchestra with Stanley Drucker and Mehta/NYP on New World, NW309
> Kjell Fageus with the Stockholm Royal Orchestra performing music of Larsson, Crussell and Mozart on Opus 3, 8801 (a wonderful recording)
> Mozart's Clarinet Concerto, performed by Gervase de Peyer
with Maag/LSO on Decca SXL 2238 (available as a Speakers Corner reissue)
> Schoenberg's Suite, op39, for 2 Clarinets, Bass Clarinet, Violin, Viola, Cello & Piano: either Atherton and the London Sinfonietta on Decca, or the Melos Ensemble with Gervase de Peyer on L'Oiseau Lyre DSLO 282
.