Many thanks for the suggestions. I picked up a few cds over the weekend:
The Vienna Philharmonic conducted by Solti performing Rienzi, Der fliegende Hollander, Tannhauser, Siegfried Idyll. Decca label.
The New York Philharmonic conducted by Mehta performing: Tannhauser, Parsifal, and Rienzi. Sony label.
Tristan & Isolde performed by the German Symphony Orchestra. 2 cd set on Pilz label. I believe the fat lady sings on this one.