Sir, No offence, but people on Pakwheels have sold cars in Islamabad at and around this level, but since you are the seller, its your right to demand what you think is right and lets hope you get a better buyer.
It really depends if you really want to sell or you just want to sell at a certain price level which is in your mind. It is better to let us konw once and for all, that price you are interested to sell at.