the net would work for this, as it would be the "Deleting Domains Network". If you did develop, this would be how I would market it. That way, once you started getting some good type-ins, people wouldn't mistakingly type the .com (as much)
Don't get frustrated with the range of appraisals. The nice thing about a FREE domain name forum is that you get a wide range of opinions to help set your price. If you just want a single, high value appraisal on all of your names, go to http://swiftappraisal.com/