So much is opinion of course. I know it is older, but I really like the Kirk Hunter Diamond for Kontakt. I think I got it on sale for a bit over 100 bucks on a group buy. Then again since you are trying to update, maybe older stuff like Hunter is what you are trying to upgrade from...
 
Dunno if this helps, but VI's big guide to orchestras...
http://vi-control.net/com...ample-libraries.49450/

Thanks for reminding us about that VI guide, bc!

How about UVI Orchestral Suite? Is it better than IKM Miroslav Philharmonik 1/2?

I read that UVI Orchestral Suite was a re-issue of Motu Symphonic Instrument which is about a decade old. It is 4.5 gigs.
 
I think the OP is more at the VSL, Spitfire or ProjectSam level, which for most of us is dreaming out loud.

Well I see that the symphony series from NI is getting no love in this thread. However, I use it quite a bit. Regarding the strings, it's my favorite library for legato strings and portamento. And the auto-divisi is a great feature.
 
The Brass Ensemble I use a lot for slow brass chords. The french horns can also do great soaring melodies when you want something a little less epic than Metropolis Ark.
 
Both libraries were just updated by the way.
 
The brass melodies in the song below are Sym Series Brass Ensemble. The string melody at the very end is Sym Series String Ensemble. (the other strings are NI Emotional Strings).
 
https://soundcloud.com/artturnermusic/evil-lurks-behind-innocence
 

Nice, work, Art. Glad somebody is using these libraries.

Nice, work, Art. Glad somebody is using these libraries.

Odd that NI has no woodwind library.