When the day arrives of stiff joints and so on, I will be sad to part with my Trads, but I would go for something less quirky than a CX. Maybe a Merc convertible, if I could find one with a manual box.
Funny isn't it. If the first Plus Six was introduced with a manual box and spare, I would 80% certain to have traded both Trads for one. But the years have made me realise that I would have regretted jumping in, even though the first incarnations are closest to the Trads.
Good choice of alternative brand being a Mercedes Convertible, they are without question the best mass produced convertibles in the world. I know I've had more than my fair share. Where I do differ IMHO don't buy a manual Mercedes (other than eg a Pagoda) as Mercedes manual boxes are crap, they are designed for auto's and it suits the nature of their engines etc.