I like Rent because it doesnt just mean the payment, it also means to tear apart, or to cause pain or distress. So it really does relate to the show in everyway.
Urinetown and Tick Tick Boom are also some good ones.
Many people don't understand that "RENT" has a double meaning. Besides beingthe money you pay to live in an apartment, "rent" is also the past tense or the verb "rend", meaning "to rip or tear". So, "rent" means "ripped or torn".