These are the wrong kind of music for you, but any classical people reading this thread, the worst IMHO are the DG "Originals". The ones where the CD looks like a mini LP record. They are really bad, unless you want some CDs that sound good in the car or boom box.
The best are any of the London Decca. The current crop are called "Legends". The earlier ones are just as good called "The Classic Sound"
For Leonard Bernstein fans, the "Bernstein Century" CDs on Sony are very good. Also the "Mercury Living Pressence" and "RCA Living Stereo" releases are excellent.