I don't like the fit of Drummond, I think we have enough bigs and definitely don't need another project. The same reasoning could be used for Robinson though I think he could be a good pick for another team.
I'm a fan of MKG, but I don't think he'll be available. Next would be Beal for me and I'm a huge fan, regardless of what would happen to Derozan.
Lastly I think this is the most likely scenario, we draft Harrison Barnes. I wouldnt be disappointed at all. He's a great shooter and all around player at the SF spot (great size). The knock on him was no progress and cannot create his own shot, but I think he can come into that and having Caldy will only help.