My feelings are if you want a 2+2 or a coupe is should be as rot free as possible. I personally would rather buy a clean 2+2 than a rot box or a coupe that is smothered in underseal to hide the many years of rot that has set in, take a look at the gallery in here and spot the upgraded cars that are considered high in wish list and value and a wash in splodge underneath. Ask yourself why some peeps buy us cars and convert them!
Too many ppl talking bull for car values, its the price your prepared to pay for the car you want. Me , I'd pay top money for a "clean and well sorted car" be it a 2+2 or coupe.