Herbert von Karajan recorded almost everything in the standard orchestral repertoire once, many works two or three times, between his 1950s recordings for EMI with the Philharmonia Orchestra, the early 1960s for Decca with the Vienna Philharmonic, and his 1960s - 1989 recordings, mostly with the Berlin Philharmonic, for Deutsche Grammophon.
For turning out reliable recordings of the standard repertoire, it's hard to beat Neeme Järvi and the Gothenburg Symphony Orchestra because their releases on BIS are always highly enjoyable, and they are dependable for accurate renditions that are genuinely exciting. The six-CD set of Pyotr Il'yich Tchaikovsky's symphonies Nos. 1-6, the Serenade for strings, Romeo and Juliet, Capriccio Italien, Francesca da Rimini, and other less familiar orchestral works, is a bargain that shouldn't be missed, for the beginning classical fan has everything necessary to begin appreciating the Russian master, while connoisseurs will find unexpected surprises in the obscure selections.
Let's say your tastes usually run to the Austro-Germanic, but you already have all of Beethoven's and Brahms' symphonies, most of Bruckner's and Mahler's symphonies, and many of Mozart's and Haydn's symphonies, so now you're thinking about trying out Tchaikovsky's symphonies. The question is: how many should you get? Should you get just the famous last three symphonies? Should you get all six numbered symphonies? Should you get all six symphonies plus the Manfred Symphony. Or should you get all symphonies six plus Manfred plus the orchestral suites? The answer, of course, depends on how much of Tchaikovsky's richly melodic, fabulously colorful, and extravagantly emotional orchestral music you're up for.