What do you mean by classical music?
If you want to do standard sounding classical music with your standard instruments (Brass, Strings, Woodwinds etc)I cant offer any advice. Ive played Classical music on the Piano and Trombone for ten years now and personally dont think synthesizers emulate these instruments well at all. For most styles of music these imitations are fine but for serious music like classical, the only emulated sounds Id use are electric piano, organ and accoustic piano voices. (you mentioned you wanted variety and that is not very varied)I use synths for strange sounds. This doesnt mean I dont do classical on it, I just dont use the imitations of standard instruments. This may be what you need since you wanted variety, unless your willing to go with the three aforementioned sounds or cheap sounding imitations. I dont even like the way the Virtuoso 2000 sounds.

Have you ever listened to anything by Wendy Carlos, John Cage, or Tomita. (especially Tomita) They do classical music on the synth that sounds great and not cheesey.