Bioshock. Definitely Bioshock. Bioshock is the only correct answer any "which one should I get?" question. Even if the question doesn't include Bioshock as an option, Bioshock is still the correct answer.
Date with the girl of your dreams or Bioshock?
a million dollars or 10 beautiful women in your bed ready to let you do whatever you wanted to them?
correct answer is Bioshock!
OK, you got me. I may have exaggerated just a little (or a lot!). Point taken. :) --- You say "greed" as though it's a bad thing...