For me the pick would be between Wizard of Oz and Dialed In. Woz has a nice variety of shots and solid challenge. Dialed In has some nice flow, rules and toys.
Hobbit is fun but I find it easy to have extraordinarily long games on it with the easy ramp shots and wide open playfield.
Pirates is too early to tell. I would wait and see on that one.
Theme isn't everything. Play the games and see how you enjoy them. A great theme on a crappy pin makes for an expensive paperweight.