I think Argentina will win. They don't have the flamboyance that Brazil has but they do have a bit of nastiness, guile maybe dirty tactics at times if necessary and then of course they have Messi and Di Maria too when he's in the mood.
They played what was arguably their best game of the WC so far with Ronaldo on the bench and Ramos having his 'breakout' international game. Why would you change the lineup just for Ronaldo?
Best thing Busi can do for himself is retire from Spain after the WC. Leave Barca in summer. Chill out in MLS for couple years before hanging up his boots.