So what did you choose?
Leadwerks most likely. Unity3D seemed a bit too much like "Pictionary Programming". Max3D doesn't seem like it's happening any time too. MiniB3D has too much that's broken, and no immediate way to fix it (unless you're Simon).Also Leadwerks Engine got a very well response from the investors.
At this point the only thing that remains to be clarified is whether Leadwerks costs more than wrapping Cipher.