Best Classical Music for Sonus Faber Stradivari

You need to give us more. Classical music is a big genre, and it's hard to know what to recommend when we know nothing about your specific taste.

Dvorak's 8th Symphony with Claudio Abbado and the Berlin Philharmonic is in my CD player at the moment...

Many of the Mercury CD reissues are very good. And, take a look at this thread about the Naxos recordings (which are very modestly priced) and pay particular attention to the recommendations from Texasdave. The Naxos catalog has some great recordings, but also has some not-so-good recordings.

http://forum.audiogon.com/cgi-bin/fr.pl?gmusi&1068320901

If you're looking for recommendations of MUSIC for getting started listening to classical, there are several threads in the archives that will help with this. Let us know and we can point you to some as starting points.
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Some labels which are not specifically audiophile but which I have often found to be well-recorded: Pierre Verany, Harmonia Mundi, Hyperion and Analekta. Great music, great performances to be found here. Try Analekta's Handel arias sung by Karina Gauvin, if you like baroque vocal.

Never buy just for the quality of the recording (okay maybe just once to use as a demo). The performance means everything in any form of music and classical is no exception.

If you're just starting out then try the Carlos Klieber conducted Beethoven 5th and 7th symphonies. They are well recorded and very good performances. Try also the George Szell conducted Brahms Symphony #3 with Variations on a Theme by Haydn. These are all pieces that haven't grown old in 35 years of listening.

You can try Gary Karr Double Bass album for a mix, the double bass should be "to die for" on your SF.