You won't actually have much choice, the cars don't compare well, the challenger will be limited production so unless you are really tight with the right dealer you will wait a long time, plus there will be a premium on the sticker. The camaro (which I want) will be at least 5 grand more than the stang and I'm sure chevy will make it undesirable at a base level as they did for years (the reason the camaro went down in the first place) Ford knows the right formula, make it fun and affordable.
I really like the concept other than the hideous taillights. I am starting to come to terms with the grille although they could have done better there. I saw a drawing of a prototype RS with hidden headlights somewhere that gave me hope. Since I love the 69 I would have trouble shelling out 30-40 g on a car which will depreciate like crazy when I can buy my dream 69 for less. People are going to pay a lot for modern conveniences.