Sorry, can't choose just one.
I don't want Ariza because he's not an enforcer, he's a thug. What would it say to Rudy, for example?
I don't want Odom because he's a punk and having Oden and Odom on the team would be too confusing.
I don't want Bibby because I think he's pretty much used up and was never more than good to begin with - better to stick with Blake.
I don't want Kidd because I don't like wife beaters. And has been said before, if any of the other 29 teams sign him the headlines would be "Team X Gets Future Hall of Famer" but if Portland signs him we'll see "Jail Blazes Sign Wife Beater".