If you liked FMA and psuedo-medieval fantasy style anime, I can't recommend Scrapped Princess enough. It's one of my favorites. I hear Claymore is another good one in the genre, but haven't seen it yet. I haven't seen the entire thing and it was a long time ago when I saw what I did, but Record of Lodoss War struck me as good back in the day. The dub was awful though. Also if you haven't seen it yet, the second series of FMA, FMA: Brotherhood. They have the subs streaming over at http://www4.funimation.com/video/?page=show&b=280
For supernatural, that's a lot harder to suggest, many of the demon fighting shows are pretty generic and not many move into other aspects of the supernatural. I remember I liked Blue Seed a lot when I was first getting into anime, but I can't really remember any details. I also liked Phantom Quest Corp. which dealt with ghost and vampires, but also don't remember much in the way of details. If you like the horror aspect of supernatural shows, Higurashi no Naku Koro ni is pretty creepy and Perfect Blue is a good suspense thriller.