Which Graphic Novel should I get?

I just got $20.00 bucks and want to get a good graphic novel. The last one that I read was Final Crisis, I then read Batman: Battle for the cowl but which new one should I get. I was looking for something that really moves the dc universe along and I really want it just to based on one of these characters; Justice league, batman, superman, or green lantern. So thanks for the help in advance