Of the possible moving parts, the most valuable player on the roster is Devin Booker – although by all accounts he is pretty untouchable. The Suns want to build around Booker, have him grow with a young team around him, and become the perennial all-star that he projects out to be.
Besides Booker, T.J. Warren would probably garner significant interest if the Suns were willing to part with him. Yet his age and skill-set makes him exactly the kind of player Phoenix wants on a roster with a core of young scorers.
If the Suns felt that a fair trade package was put together, I believe that any of the three CUB rookies could be traded, especially if who was received in return would be a proven star in his early to mid-twenties.