D.J. Augustin seems the the safest pick. The longer you delay getting Mike D'Antoni his engine, the longer the healing process will take. So if you have a chance to get a player who plays like Steve Nash and WANTS to pass the ball and a floor general and make his teammates better, you have to do it. I know there are questions about Augustin's size but it's not a big deal. Chris Paul, T.J. Ford, Damon Stoudamire, Terrell Brandon and Tim Hardaway to name a few, were also 5'11"-6' tall.
Being a great pointguard is not about raw speed its about the ability to CHANGE speeds. Look at Nash. In no way is he even in the top 5 in terms of fastest or most athletic pg's, but he never ever ever picks up his dribble and he creates space by seemingly jerky yet controlled spurts of speed that keep the defender off balance. Splitting the double team is about being able to sense the defender being off balance and knowing when to pass and when to shoot. Augustin has that.
The best thing about DJ is he has long arms and quick feet and was a good defender in college.
Hollinger's article on ESPN; His system actually has Augustin ranked higer than Derrick Rose.