Well I just picked up a GOT Pro and have to say that it has exceeded all of my expectations. Super fast, great flow and amazing rules already! Honeymoon phase still but it really is a lot of fun to play. You don't need to be a fan to enjoy this one.
You also can't go wrong with an IM. IM is absolutely brutal.....but I (and many others) love fast brutal games.....it really does "fight back". But that's what makes it such a great "just one more game" pin. It's also probably the best multiplayer pin Stern has ever produced. No one has to wait and even poor players have a shot at winning.
Other candidates - MET Pro, ST Pro and TWD Pro......all great titles.