Just looking at the main events it's Aldo vs Zombie for me by a mile. Next would be Gus vs Jones I suppose. I think there are guys out there like Glover and even a Machida rematch that would present bigger problems for Jones then Gus does. But Gus does have the striking to beat Jones, I'm just not sure Jones will give us much of a chance to see it.
Even if Zombie gets destroyed by Aldo he will show the Samurai Spirit and go out in a blaze of glory. So that is pretty much can't miss entertainment.
I'd have to take a look at the undercard to see which card I'm really looking forward to the most. But the majority of those main events don't do a whole lot for me.