As Pam said ,have a REALTOR(R) pull comps for houses similar to yours, in your neighborhood, with and without basements to determine the difference.
And as Maureen said, either you have a basement or you don't and nothing really offsets that, because when people search for a home that meets their criteria, if they want a home with a basement, they will search for homes with basements and yours will not even make it into their list of possibilites.
So once you have your comps, you can acurately price your house, sans basement. And for this question, that is really the goal, deriving an accurate price. Now you can list your home with a realtor, with a true fair market price and get the home sold to someone who is NOT looking for a basement.
The lack of a basement to a buyer who demands a basement cannot be overcome. However, for the buyer who does not demand a basement, he wants a house that is priced reflective of the missing basement. Once you do that it will sell, if marketed properly.
Get it priced right and git'er done!