I missed what Rondo did. No idea on whether he'll get a suspension or not ... but if he does, I would go with Jason Terry.
Barbosa is strictly a pick and roll player as a PG. Bad fit as a starter (too limited as a floor general and passer/playmaker) but usable as a backup PG ... when Barbosa can be the main offensive option on the floor and the guy you want to have the ball in his hands the majority of the time.
Jason Terry may not be anything special as a passer / decision maker but he is more well rounded than Barbosa and better suited to being the lead guard. He'll do a better job of keeping others involved. A capable setup guard.