I thought Coach Bud was safe in ATL since they stripped him of all their players. My guess is it's his decision to move on, with the Suns further ahead in the rebuilding process than the Hawks, he also relinquished the President title last year.
I'd look at anyone from the Spurs and Pops coaching tree.
Clifford was fired by the Hornets so there you go, we should give him an interview too. He had a tough situation there, although guided them to the playoffs a couple yrs