Coupe (fastback) prices are the same I think. There is more demand for them, but there are also more coupes available. So supply and demand even out somewhat. The good news is that it should be easier to find a buyer for a coupe.

When we start talking about superb-condition cars (nice paint, perfect interior, no dents, etc etc), then the price goes way up. People are asking about 3500-5000 for extremely nice ones. I haven't heard that any actually sold at this price in USA, but that's what they were asking.