Hello jonlipow
Which library? On the one hand it depends on the music and the syles you will play.
But on the other hand you always are in a good initial position when you own one or more complete string libraries.
So why don't you buy the Appassionata (I) extended?
The reason is, that in quite every composition the strings have important parts or melodies.
Further, the strings are sitting in front of the winds and the percussion instruments > closest to the listener...
So if you are able to play the strings as realistically as possible the half of the project is done...
Beat
- Tips & Tricks while using Samples of VSL.. see at: https://www.beat-kaufmann.com/vitutorials/ - Tutorial "Mixing an Orchestra": https://www.beat-kaufmann.com/mixing-an-orchestra/