I have 30 or so SACDs but like all formats their quality varies according to how well the recording engineer made use of the bandwidth and preserved dynamic range.
For outstanding sound quality, I can't say enough superlatives about the Mobile Fidelity SACDs. Highly Recommended for exceptional sound quality;
Patricia Barber: Cafe Blue, Modern Cool, Companion, Nightclub
Ravel Bolero Minnesota Orchestra, Stanislaw Skrowaczewski conducting
Coleman Hawkings: The Hawk flies High
Other high quality SACD issues:
Rebecca Pidgeon: Retrospective
The World's Greatest Audiophile Vocal Recordings
Livingston Taylor: Ink
Wille Nelson: Stardust
Eddie Higgins: Tenderly, Best of Eddie Higgins
Dave Brubeck Quartet: Take Five
Jacintha: Here's to Ben, A Tribute to Ben Webster
Audiophile reference IV
David Sanborn : Time Again
Cecilia Bartoli, Gluck Italian Arias
Superbass 2, Ray Brown, Joseph clayton, Christian McBride
Lesser Quality (Get the regular CD instead):
Roxy Music, Best of
Peter Gabriel, Shaking the Tree
Sheryl Crow, The Globe Sesssions
Eric Clapton, 461 Ocean Boulevard
Monty Alexander, Stir It Up