I don't think they'd even consider it, to be honest... if they were going to do it with an original body style, it would have to be an E-body. They're the closest thing Chrysler ever had to a dedicated performance platform back then, and they're easily the most popular now (going by price)--so that's what they'd target. It would be the Challenger, for a couple of reasons: it was more popular when new, and there's no Plymouth Division anymore.
If they were just going to resurrect a name and styling cues, I would say they'd go for the Charger. They already did it for the concept car... you remember--the red one with nose that looked like an '87 IROC? The Charger name is arguably the most-recognized muscle-era Chrysler Corp. moniker, and the sultry 1968-70 "double diamond" styling basis adapts well to nearly any size vehicle... that concept car was a beast, if you've never stood alongside it. The car companies are all about whoring these days, so they gotta go with the girl everyone knows.