To be honest, I don't know much about most of the drummers in the poll, so I can't judge who will be chosen. From what I've heard, Mark Zonder might be a cool addition, but he's currently working with the UK band Ten (which is a highly underrated act, BTW). Richard Christy would also be fun, especially since he's jammed with the band on a couple of live shows. However, he's busy with the Howard Stern show, and I don't see him taking time off for a DT tour.
Mike Mamgini is an intriguing option, because he's taken part in a diverse range of projects, from Annihilator to Extreme. However, I'm not familiar enough with his work to say if he can do some of the quirky drumming that appears in much of DT's work.