Sound Iron Olympus Elements. Choir library $99 -$119

For the free Kontakt 5 Player - $119
For full Kontakt 4 or 5 - $99
 
You may also consider the player version if you like to use the libraries tab in Kontakt rather than navigating to the NKIs
 
Demos sound pretty good, basically it's a light version of the $550 Olympus Choirs. I can't say I am not tempted. Details HERE
 

"Olympus Elements is a powerful choral toolkit that puts the core functionality and rich sonic power of our full Olympus Symphonic Choir into a compact and easy-to-use package for everyone at an unbeatable value. Olympus Elements is designed for both professionals and casual users in mind, with years of virtual choir engineering and refinement distilled down into one extremely potent and simple solution that captures the spirit and power of a full 63-voice symphonic choir."
 
"The full retail version of Native Instruments Kontakt version 4.2.4 or 5.1.0 is required to use .nki instrument program presets included in this library. Kontakt 5 required for all time-stretching and save/load features. The free Kontakt “Player” and special “Libraries” browser rack do not support this standard open-format Kontakt library."

I got this and have just been palying around with it. I like it a lot and it does what I hoped the Kontakt factory choir would do. There will be a bit of a learning curve to get the best out of it, but it seems to be a nice compromise between basic Ahhhs and a full blown Choir package.