JLR dealerships will purchase the vehicle back from you. The going rate for 2015 HSEs is between $62K to $63K in the Washington DC area.
Yes, you would be best trying to sell it outright if you have the time and tolerance for that. Personally, I do not do that anymore because I don't want people coming to my house expecting a free test drive. It just depends if you are comfortable with doing that. If so...then sell outright.
But if you find a good car you can trade-in and get the tax savings. I assume in NC that you only pay taxes on the difference. Something to consider.