I haven't played Two Thrones, but I hear it's a good game. If you liked the other two PoP games, you'll probably like it, too. It's supposed to be much less angst-ridden than the second one, which is a good thing.
Fire Emblem is one of my favorite games of this generation. If you like SRPG games, you can't go wrong with it. I highly recommend it, especially if you like either of the GBA Fire Emblems, any of the Advance Wars games or either of the Final Fantasy Tactics games.