I am at this crossroads too. Bought a new laptop yesterday and I have my 8.5 discs here and, so a couple of things I may take from them, Pantheon and V-Vocal, but I am interested in just installing X3 , but just the instruments I use. Some of the bundled stuff like Lounge Lizard Session, I have the full AAS Range and Ad 1 (well 2 now) I have expanded to Ad2 and have 7 kits. I Have their Keys too, so may not install True Pianos. I wouldn't like to have a fucus on the higher quality instruments.
There a quite a few analogues, but I may just install Ultra Analogue. I started with a bassstation and focusing on just one allowed me to really understand what I could do with it. I think maybe reducing my options will help my focus in the long run. But to have the option to add in later would be desirable.
Or should I just install just the plugs from 8.5 I think I may go back too. Pantheon, V-Vocal. What else would there be?