For reference - a friend of mine bought Vin #001 of the 2nd gen Viper. $100k MSRP and at auction he got it for $220k. That auction was the first time it was sold, he got personal delivery from Sergio Marchionne and everything.
I feel the new Bronco is similar - a remake of an icon that wasn't made for a few years. So I say double or triple the highest MSRP - so I guess $150k.