About how much would it cost to insure a 2010 or 2011 Dodge Challenger?

You've hit on the major things that govern rates but there's still more to consider. The state you live/drive in, how far you drive daily on average, what your car is generally used for while driving, not to mention the variables that each insurer might use on you and the weight each carries. Like the old saying goes you need to shop around. My ex used to work for an independent auto insurance company that represented a variety of insurers. In short she'd explain that each person's situation is different and just because two people have similar situations, their rates can vary greatly because of how each insurer "looks" at each customer.