Without question: Ivan Fischer and the Budapest Festival Orchestra: Beethoven, Brahms, Rossini, Dvorak, Tchaikovsky, Rachmaninoff, R. Strauss and Mahler on Channel Classics SACDs. Plus the first, and still one of the best, mch SACD demo discs: http://www.sa-cd.net/showtitle/4487
And the first 8 Beethoven symphonies on Tacet.