It depends a bit on what kind of classical music you want to play or compose, but a string library with as many articulations as possible is essential as well. Maybe that would make more sense than more woodwinds and brass. The two libraries you want don't really add much to what you already have.
In larger orchestral works, you can no longer hear so well whether the wind instruments are divided according to divisi or whether the voices are simply played with the same samples twice (Dimension Brass).
The Synchronized Woodwinds have also been recorded very carefully. You are well served with them.
Strategically, I would work towards having all "Synchron-Libraries" later on. So why not Synchron Strings Pro or Elite Strings?
That's not what you wanted to hear, but maybe the string library thing is worth thinking about anyway.
Beat