When setting the price, think of what you really need to get out of it. In your head, set a bottom dollar price . . . the price that if you can't get that, you won't sell the car. Then think of the price you would really "like" to get. The price where if you got that for it, you wouldn't have any problems letting it go. Then, add a few hundred to that price. The theory hear is you have a starting point and somebody might think that's a good deal and take it . . . You're happy, their happy and you have a lot of extra cash in your pocket. More likely, someone will try to talk you down. You can afford to come down and still be happy if it sales. If things drag on long enough, somebody might offer your bottom dollar number and you might be ready to take it.
Or, short version, Ask more than you really want or need for it. It's EASY to drop the price if you need to, but it's REALLY hard to raise it once you set it.