I used to be almost exclusively 12" figures, but with the recent price increases and (in my opinion) drops in quality that we saw with the recent Han and Luke figures, I'm starting to sour on them. Plus, I've started running out of room to display them and I don't like the idea of buying things just to keep them stored away in boxes.
At the same time, I've found that I really like PFs and 1:1 pieces, so I expect my collection to expand more in that direction. The 1:1 pieces are particularly nice. I only have Yoda and Salacious Crumb right now, but they're two of my favorites. I also got a good deal on a slightly damaged Greedo that should be coming sometime next week.
I also like props to some degree, but I'm pretty selective about what I'll buy. It needs to be very iconic (or cheap) for me to bite.