Well I really have a hard time recommending an opera recording from a audiophile perspective. The quality of the singing should trump the quality of the recording.
That said, the Solti/London Philharmonic recording is very good from a singing perspective, so if Pls1 thinks it sounds good, then give it a go. The one I am referring to has Ramey, Allen, TeKanawa, Popp, Von Stade. It is London/Decca 410-150-2 (3 CDs)
Also take a listen to Salomaa, Hagegard, Auger, Nafe, Bonney; Drottningholm Court Theatre, Arnold Ostman conductor, on Oiseau-Lyre 421-333-2 (3 CDs).