Not a difficult question since I did sell of all my MWs last year apart from some key volumes:

X-Men 6
Avengers 10-12
Warlock 2
Captain Marvel 2-3
Captain America 3
Nick Fury 2
Inhumans 1

Those are my top 10 - mostly Neal Adams, Starlin and Steranko stuff. I also kept Black Panther and Deathlok.