I see SVG seems to be a popular choice. Personally, I can't stand the guy. He might be a good "X's & O's" coach, but, as Shaq once said, "he's the master of panic". SVG just doesn't seem to be a good manager of personalities either.
I've always liked JVG, but I doubt he is interested in coaching anymore. Seems like he really likes his cushy gig at ABC/ESPN.
Honestly, it would depend on the direction the team was going in. For a rebuild, I'd be fine with young, up-and-coming coach. If we we're trying to be a contender, I'd prefer a more veteran coach with experience.