My favorite is NARS loose powder. I found that it worked better for me than Laura Mercier. I liked Laura Mercier too but I think the problem was I tried translucent and it just didn't work for my skin.
I want to try BE mineral powder, as well, but when I was searching for a decent loose powder, I read rave reviews for the low-end drugstore brand NYC (New York Color) loose powder. It's under $3 and has been compared to MAC loose powder, and even raved as better-than!