i myself would get the barracuda seeing how everythings there and fix it , challengers are cool but too expensive to get parts for and buy looking at pics of the chally and the camaro it seems to me you dont really have money falling out of your you know [ kinda like me ] but it boils down to this is, it what you really want? be it a mopar,chevy, or ford let's say you do get it and everything is great ,.....but theres one thing about the car you dont like so here you go again for sale or trade etc, i traded a really nice 66 coronet 500 for my dart at that time my dart was a complete basket case it needed everything and i mean everything the only thing the dart had going for it was it was rust free and straight except the bolt on items doors,fenders,etc the coronet just needed seat covers and wash&waxed but a 70 dart swinger is what i really wanted so the deal was done and guess what almost 10 yrs later a wife, a son , alot of other bills for living i still have that same car why? because it's what i always wanted
so not trying to get you mad or upset you is it what you really want to enjoy and fix up?
hope this helps