Got full Kontakt? Check out this
solo violin library. [FIXED LINK]
Where all but the most expensive string libraries fall down is when playing fast, short notes. That's specifically what this library does. Nothing else. If you want to mix staccato and legato articulations you'll need to load another instrument and try to match the two tonally. But despite its limited scope, at $14.95 it's an inexpensive way to bring your orchestrations up a notch in credibility.
(Note that the site says you need full Kontakt 5. However, the developer says that it's currently fully compatible with 4.2. He just wanted to reserve the possibility of adding some K5-specific scripting later on, so he specified K5 in the Requirements.)