We've all heard the expression, "Money talks." Money talks very loudly when it comes to selling (buying) a used car. Of course you want to get as much money for your used car. The key is to be reasonable and to try not to overprice it. Chances are that you have become somewhat emotionally attached to your car. So even when you think you are being reasonable in sale price, you probably are not. In order to remain objective, you have to do your homework first.
The first place to get an idea of what your car is really worth is to look up its value in the Kelley "Blue Book" under "Private Party Value." You have to honestly assess your car's condition because the buyer won't care that you have many memories with your car. Another place to get a feel for what your car is worth is to check used car listings for similar cars. Also, you can visit dealers and see what they are selling their cars for. Just keep in mind that they will probably be higher because they can offer more features, warranties, and other services that you cannot.
Since just about every used car needs some sort of maintenance, you should take that into consideration when advertising your selling price. Whether you decide to repair your car first or sell it "as is" you can advertise "price negotiable," or "or best offer" (OBO). This is a tradeoff because while you may attract more possible buyers, you may also be opening the door for allowing your car to be sold at a lower price.
The most important thing to remember regarding the price is to evaluate your car honestly and objectively. Keep in mind that the buyer will not be attached to your car and will, therefore, not look at it with nostalgia like you do.