If your buying an ACR for bragging rights, and cruising to your favorite hamburger joint, then certainly the standard ACR is the way to go. If you actually want to race the car around AND possibly, just possibly you might want to sell the car in the future......which car do you think will hold up better in value? A factory built car that was set up properly or take your chances with some guy that hacked up his street car and claims it was done perfectly? Is it possible that the street ACR was done even nicer than the factory, yes, but it's a tough sell. Additionally, I can assure you that if you think it's only a couple of bucks extra to take a factory ACR and make it the same as an ACR-X you have NO idea of what the actual costs are. I'm just stating the facts, for some of us (me) every penny is factored in.
Without question, if your looking for dual purpose use car (street and track), youv'e got to buy a regular ACR, just expect to pay an additional 30-50K to have an equivalent car that's not factory built.