Jim Zorn's resume' as a QB coach is top notch.
John Ramsdell's got the Rivera connection and did pretty good work with Philip Rivers (though you could argue not so much lately).
Jeremy Bates worked with Jay Cutler, so you could say he's used to guys with big personalities (though Cutler's kind of a problem child; Newton's not in that category).
I'd take any of those guys, with Zorn probably being my top choice.
I'm not familiar with zorns work as a QB coach as much as his failure as a HC to be brutally honest, what's his résumé as a QB coach?