I've been through them all in the search of the right line up. My current virtual Jazz/Funk line up is:
Organ - UVI B-5 Organ, best one I've used so far!
Clav, Whurli, Rhodes etc.. - Keyscape, perfect for this style, sounds authentic and covers all bases.
Guitars - Orange Tree Jazz Archtop and Evolution Strawberry, Scarbee Funk Guitarist sometimes (and usually play a real guitar too)
Bass - Ample P and Ample J and Ample Upright, all you need really is covered between these 3.
Drums - Superior Drummer 3 with Roots SDX for the Jazz option
Horns - most effective and easiest to blend with the above for me is Session Horns Pro from NI (alto sax is pretty good in here too). With some tweaks and using the individual patches these are stunning. I also use Sample modelling Trumpet and Trombone for solos.
Extras: Pure Jazz Vibes and Passion Flute from Orange Tree
I turn off all default instrument reverb and use UAD Ocean Way and the Lexicon 224 reverb's to blend them into the same space.