Depends who you want. For example, I'd take Exum over Parker, and Parker is considered one of the top 3 prospects, so I'd take 15 to move back, obviously.
You could definitely see the potential teams are falling over. But there's a lot of things he really needs to improve. I wonder if GM's drafted just off of the current impact a player would have as a rookie, where would he go? I don't think he would be in the conversation as the first pick.