I've recently acquired Versilian Studios Chamber Orchestra, a nice package of Kontakt-based samples for expressive and intimate orchestral ensemble play. It works very nicely with Notion (so far as I can tell).

Here's a recording I made recently using it:



The package is on sale at the moment, at several different levels. There's a free community edition, a standard version at $69, and the full professional version at $149. It's a great deal IMHO.