Selling price for a 1989 Coupe DeVille

I inherited my mother's '89 Coupe DeVille.  She was the first owner and I the second.  I'm looking to sell it and don't know it's value.  It is in excellent condition and we repainted it 2 years ago a spectacular metallic copper with a metallic silver bottom trim.  Any help in valuing the car would be appreciated.  Thanks.