It's tough. Rubio and Griffin are pretty much slotted to go either 1-2, and the Clippers and Memphis can sorely use a point guard--Memphis also needs a power forward, so it's basically zero chance to trade for either.
From then it gets a bit interesting. #3 Oklahoma City has its most pressing needs probably at shooting guard or center, but since shooting guard is the easiest position to fill when it comes to free agency don't be too surprised if they go for Hasheem Thabeet, sadly (interestingly enough, OKC has desperately been trying to find their next "big" in the draft without much success--they've drafted Mouhamed Sene, Robert Swift, and Johan Petro in the past few drafts, and now two of them are out of the team and one is chronically injured). James Harden is a possibility here too, but they already have enough scorers, so I think they'd like to get an interior defender to cover up for their fast pace team. So unless something drastic happens, I think they'd go with Thabeet, and it would be unlikely for them to trade him if they do get him.
If that's what goes on in the draft, that would be one of our worst case scenarios--first bad position in the draft, then no chance at Rubio, no Thabeet gambit...what then? Really becomes tough. Most proven player on the board would be Harden, but do we really need another wing scorer when we can fill out holes?...Not worth it. I don't like Brandon Jennings either, question the defense and whether he can fit into a team concept, but I would prefer him to Harden if it comes down to it. Hill can swat shots, but he's a role player all the way on a team where we are absolutely stocked with bigs of similar size. DeRozan--I think he's already a bust, turnover prone, extremely raw, a black hole; Evans has flaws but I think he's a bit selfish, and we don't need a player of his prototype. So I'd go for Stephen Curry--his shooting is a great asset, he's smart and competitive, and I think he can develop his passing ability--but that requires us to trade down the draft. But that's just a preliminary layout.