I agree with millercarbon's 2nd paragraph. Ask a price that is fair and reasonable after doing some research and hold to it because if there are knowledgable buyers out there, they will know that and won't haggle just to shave a few bucks of one's price. That is not to say that they can't or wouldn't make a counter-offer which you are free to accept or reject if you think it's close enough (or not). But just dropping the price on your own is negotiating against yourself and shows lack of confidence and buyers will pick that up.