If the worst case scenerio happens to the Cavs, they drop to 6th & Wiseman is gone, I would give Precious Achiuwa out of Memphis a hard look. I think he's being slept on, nbadraft.net has him going 12th. I know he'd be considered a reach @ #6, but imo he has higher upside than most guys projected ahead of him.
Having done this, I would shift my focus to Udoka Azubuike. He's another guy being slept on. He's a very young Senior, hasn't turned 21 yet. He has a massve 7'6" wingspan, giving him potential as a rim protector. Is listed @ 270 pounds, strong enough to power his way to the rim @ the pro's. I would trade future 2nds for the 30th pick & select him.
I've mentioned Saddiq Bey. He's another guy I'd like to see in a Cavs uni. He's 6'8" with a 6'10" wingspan & a potent offensive arsenal.
It would seem far fetched for the Cavs to get them all, but with the right maneuvering, it's possible.