Since I'm really only lacking the Rick bass*, I'll probably not get K9 unless they add some "must have" feature or instrument that makes the upgrade worth it. So I'll be getting K10 if and when. K8 Ultimate and Action Strings, Session Horns, 20s drums and The Giant make up a very nice library (in addition the other great stuff I have: Mars & Venus Choirs, Kirk Hunter CS2, CB2 and Diamond etc.)
*Ya, I even bought that 20s drum kit