Difference being ofcourse you can get into a new GT for as little as 23 grand. Not sure how you'd swing that on an R/T.
My local dealer had two R/Ts sitting out in the lot and a third in the show room. Stopped in to check out how much they wanted. Truth be told I've always wanted to get a Challenger. These were pretty much loaded R/Ts. 38 grand on the sticker. Screw that.