I agree with the others. BDK is a good game, but SM is a lot better. Personally, I would only buy a BDK if I already owned an SM and an IM. I think there is something very cool about having all the modern superhero pins lined up the way tatman has them. The main problem with BDK, in my opinion, is that it's just too darn easy. Ball times are really long on that machine. SM is much more challenging, has better flow, and has a deeper ruleset.
Of course, you shouldn't just go off our opinions. Before spending that kind of money, you should really familiarize yourself with the ins and outs of both machines. Plus, if you happen to like one theme more than the other, or really love a particular art package, that would certainly affect your overall opinion of the game. To me, though, it's a no-brainer. SM all the way! 
Folsom, CA
