Hard to say without having the results of the combine. The more info you have, the better the decision. However, the top players left are, Beal, J. Lamb, Henson, Ziller, T. Jones, P. Jones, Sullinger, and Rivers. Just below those guys is Ross, Taylor, Leonard, Q. Miller, Marshall, Harkless, Teague, and Moultrie. The dropoff between the two groups, isn't that big, and I wouldn't let the difference influence my choice to a large degree. And, to put the talent in a different prespective, about 80% of these guys would have been top 5 picks the year we drafted Never Nervous Pervis.
Our two biggest needs are at the SF position, and depth at either PF or Center. So I would narrow my choice down to SF's Miller, Taylor, Ross, P. Jones, and Harkless, or C/PF's, T. Jones, Sullinger, Leonard, Henson, Ziller, and Moultrie. In the first group, my choice is Taylor, who I could probably draft lower, and would try to trade down if thats my choice. In the second group my choice is either T. Jones, or Moultrie. Once again, if Moultrie, I would try to trade down.
If I decide to go BPA, then its either Beal or Lamb, and in this case, I would go with the player most ready, and that would be Lamb. Although, Beal may end up being the better player down the road.
Note: I seriously doubt that Barnes will go top 5. If were sitting at 6, then I firmly believe he'll be there. If you want to go high risk/high reward, then select P. Jones. He could be someone that wastes 4 years of your time and money, or he could be on the all star team in a couple of years. Pick your poison!