I am not trying to tell you how to do business, but most folks on here will respond better if you set an asking price. I know many folks ask for offers hoping to get one that is better than what they might ask for, but it just doesn't happen in today's economic times. Most of the time, the offers are low-ball offers.
Set a price that you could live with, and you have a better chance of making a sale, IMO. Seems to work for me pretty well.