Months ago I suggested Levin, Breitbart, Coulter as a possible three. I think Limbaugh would be too dominant of a personality, which is why I shot a bit lower on the totem poll - or is that pole? But I like your thinking.
I would have no moderators in a debate between Gingrich and Obama.
There would be a timekeeper, 45 minutes per subject, and broad subject areas: defense policy, foreign policy, economic policy, homeland, and social concerns.