I’d recommend sticking with the European orchestras. Look for Staatskapelle Berlin/Barenboim, COE/Harnoncourt, Zurich Tonhalle/Zinman, Vienna/Bohm or Rattle. HIP/original instrument versions from Orchestre Reveolutionnaire/Gardiner, Orchestra of the 18th Century/Bruggen. These are all complete sets.
The only American orchestra set worth acquiring is the Cleveland/Szell set on Epic/Sony. “Cracklin’ with energy”
Do I have to pick just one? OK, today I’ll go with the ‘99 Staatskapelle Berlin set on Teldec/Warner. An amazing band with a distinct, rich “old school” tone led by Barenboim who brings his Furtwangler-inspired style of conducting. Tempo, balance, rubato, technical precision, architecture, dynamics, energy…it’s all there!