If you live closest to Cambrian, go with the BirelART, or one of their used Birels. That’ll be the closest to you so parts are available and they are (appearing to be) a good shop.
Troy, I wouldn’t be too concerned about the chassis too much in terms of built application quite yet. I’ve seen plenty of guys just throw a 206 on a “2 stroke” chassis and run just as well as everyone else. For the time being, we’re just trying to help this man find a brand in his area that’ll get him on the track