Unfortunately, I think that anyone trying to buy a Challenger the first year will pay way over MSRP- simple supply and demand economics.
I, for one, will wait until the demand dies down somewhat, and will buy from a dealer who gives me the best price- even if it means having the car shipped from out-of-state.
From researching the Charger SRTs, I found that many buyers were paying MSRP when they first came out. Now, if you look around you can pick them up at or slightly above invoice (with a $3,500 factory rebate as a bonus)!