I was ramping up my Jessica collection right around the time the Haunted Mansion pins were the biggest craze, and I always said that I liked some of the pins from it, but would never touch it with a ten foot pole...I just wasn't willing to dump the effort and money into it. But in this scenario, I would go get those HM pins that I liked!
Other than that, I would collect Frozen. I only like the movie (not love it), but the pin aesthetics are right up my alley! Oh, and some Tangled that I've missed out on.
And, of course, all the old DA pins that are STILL on my Wants list, after all these years...