I am always changing my mind about which villagers I like best, mostly because I see new ones I want all the time when I am playing hide-n-seek on island or visiting Dream Addresses. I finally took my list of Dreamies off my sig because it changed each day, I have only played a bit over a month though so don't really want to commit to permanent villagers yet
I feel a bit like that, too! Nate, Julian and Deirdre (if I ever get her) are the three I'm absolutely keeping for as long as possible. The others I might let go if they decide to move, or I might trade them for someone else.