Look and see what others are saying about the sim. I think I would list as w/o sim. You don't need to worry about a blank sim. Buyer will have one.
Also if you are on 2.0, go to settings-general-reset. You will see "Erase All Content and Settings". Be sure to do this. It will take about an hour.
Just some unsolicited info. Be willing to sell international and you will likely get more. Good Luck.