Odeon GM or Palermo PM

I am not sure which combo of two would be best - Palermo and Tivoli - or forget the Tivoli altogether because it sorta looks like the palermo...and get the Odeon and the Palermo - but maybe they're too similar - !!!! AH! I have all three on my list but the thought of all that money on mono bags is giving me anxiety!

Thanks for the help!