You can do an advanced search on ebay and select Completed listings only. see if any of them are similer in condition to yours and set the pricing similer to those
All I have to say is that you better be charging the client by the hour because it is going to take a liong long time to get it to loot like it was never there. If he dosnt want to pay for it use a simple blur over it.
Unless you have access to an HD DVD Burner i assume that you are making a regular SD DVD in wich case exporting as SD video is not going to make a difference in the quality of the final product.