Here's a way to put it in to perspective. In 1970 a new house cost $23,400.00 and a new car in 1970 would be about $3,510 (or about 15% of the cost of a average home). Todays median price of a home is $217,900 and 15% of that is $32,685. So if using todays dollar and we were in 1970 a new base model Challenger would be about $32,685.
Also using todays dollars, adding options and stepping up to a Hemi in 1970 would put the car around $55K to $60K (in todays money) Options add up FAST
http://www.hamtramck-historical.com/dealerships/1970SalesmansPocketGuidesDodge-01.shtmlWhen you look back then in todays dollars it's not much different than going down to the dealer right now, if anything the prices are better now then they were back then. Base model 2011 Challengers are about $25K and add options and a bigger motor puts you about $45K. That makes todays Challengers cheaper now then new ones back in 1970 (using inflation).
The prices for new cars today is about the same when you account for inflation. So go buy all the rare cars you want... they're easier to find today than in 1970. For that matter, a used viper in todays money is like $3,000 in 1970 money.