I would rather go after JJ Barea than Luke Ridnour (if both are in the offering).
I think the team needs someone like Barea more. Barea gives more dribble penetration and playmaking whereas Ridnour is more of a setup guard.
It might depend on if you see a difference on defense, especially if the guy is on the floor at the same time as Bradley. (I don't know who is better.) Also, if you want a guy who can start at the beginning of the season and slide into a bench role, who is a better fit might be the guy who is better at providing minutes as an occasional two-guard.
If that isn't a factor, I think I like Barea more than Ridnour based on Barea probably being the better three-point shooter.