Market price is what people are willing to pay you to buy your car. If enough people have seen your ad and contacted you, you should take the best offer you have got so far as the market value of your car and then take decision of selling or retaining on the other factors relevant to you. Getting emotionally attached to a certain figure when selling a used car is nothing enjoyable IMO.
Just my opinion.
Best of luck.
Sent from my Galaxy Nexus using Tapatalk