Floor Coverings

We have been getting estimates as to the cost of replacing the old carpet in this house with hardwood. The good news is that we found out that the carpet in the hall and bedrooms was put down over hardwood; so that part of the job will be much less expensive than the other work. They will simply remove the old carpet and sand and finish the hardwood underneath. The large family room and the kitchen do not have hardwood underneath, so those will be much more expensive to get done. We got one estimate today, and the other company that came and measured has not given us their estimate yet. Does a total of $6,400 for this job seem about right to any of you who know about flooring?