I like most of Chandos covers.  BIS & DG have excellent covers too.  And
what about Praga!.

About individual covers, the "Set of Five" (New Albion), Lloyd's "The Vigil
of Venus" (Argo), Panufnik "Arbor Cosmica" (Elektra Nonesuch), the Praga CD
with Shostakovich violin concertos and the Koch Schwann with Schoenberg's
"Red Gaze" (oil on cardboard) are among my favorite.

Any Ute Lemper CD is at least a "Cover Warranty":-)

Dave.