I haven't got a clue what I'd purge? My collection is so diverse and little things have special appeal in different ways. Plus I'm always purging anyway, so it isn't much of a stretch. Plus I broke the completist mode a long time ago, so it's made it easier on me. Broke my heart to watch OCB sell of his Simpsons stuff but I feel lucky I was very narrow in focus with those, so there's only a limited amount I have anyway.
Things I'm fond of:
Star Wars OT stuff - GG, Sideshow, Hasbro figures
WOS Homer figures
Marvel Legends and DC stuff
Certain, meaningful sports picks (the custom Selanne a guy paid to have done for me is not going anywhere)
I think the last thing to go would be the loose, vintage Star Wars collection.