I'd go with Hawes or Conley.
When you look at players that could be there around 10 ALL of them are going to have some warts, you just aren't going to find the perfect player still hanging around at 10, so you are going to have to take someone who is maybe not as strong in 1 or 2 areas as you would like, but has the rest of the package.
I think out of all the players that will around when we pick the 3 with the biggest upside are Hawes, Conley, and J.Wright. Personally I'm not sold on J.Wright, I just don't think he has a whole lot going for him besides athleticism.
Conley's only real blemish is a suspect shot, despite some posters claims here I believe shooting is something that CAN be corrected and improved on. Will everyone be able to do it, of course not, but does it have a chance at being fixed and improved on? Definitely. Besides the shooting, Conley can pretty much do it all and if he does improve his shooting he will be an all-star for sure.
Hawes catches a lot of flak for the Brad Miller comparisons which I think is really unfair. Their only real similarities are their size, skin color, and passing. Other then that Hawes has a much much more advanced post game, isn't afraid to bang inside and also plays decent defense (not outstanding, but not Miller bad). He is also young and has good BBall IQ which means he should be able to improve his game a lot. His rebounding also gets mentioned as a weakness, but he played next to one of the best rebounder's in college and naturally that's going to take away some boards from him. He also said he was more concerned with fundamentals like boxing out and footwork in regards to rebounding instead of just going up to get the ball. Once he works on that a little more and gets a good solid base to go from he can be a good rebounder. He is also knocked for a lack of athletesism but I think that's just unfair, in the in the 2005 Nike All-American Camp he tested as the 7th best athlete. Also keep in mind he is only 19 years old!