just a point or two I always make in these situations..
value and worth are completely different concepts, I don't care what you spent on it as in my eyes its worth it! for two reasons...
1) you are never selling so any percieved loss is only ever going to be on paper, and values WILL rise eventually and great ones like that will command big money, your never selling but nice to know anyway that the cars monetary value and what has been spent on it will at some point be close enough together that it neutrals out..
2) you couldn't buy a new car anywhere near as nice or as charming, they all look the same,sound the same and are ruined by emissions controls, and even if you did the depreciation you would suffer in the first 5 years puts your spend on another 10 years of motoring into perspective..
3) after lots of driving of GTV's I think the Twinnie is the better car. not the fastest, but the most balanced and the purer drivers car.
if you are ever going to sell, first refusal please..