Not sure if this is what you are after, but Curt Scott has a great Buyer's Guide that is on Cobra Country ...
http://www.cobracountry.com/home2.html
Just click on the Buyer's Guide tab and it will take you right to it. There is a lot in good information in this publication. While you are on Cobra Country, take a look through the Cobras for sale and the ones for sale on this site. It's a great way to see what's out there and help you decide what you are looking for.
Hope this helps and happy hunting!