Buying a sports car that won't depreciate - what do you suggest?

I'm thinking of spoiling myself and spending about £40K or more on a retirement present. I currently run a 1999 Mercedes-Benz 320 CLK Elegance and have done so since 2001. Just had a new mass air sensor...

Previous monetary harm

In your experience is there any evidence to suggest that vehicles having multiple previous owners has a negative effect on valuation for trade or private sellers to take into account in price setting?...

Buying a modern classic

I've come into some money and want to buy a great used car, but I hate depreciation. What cars would you recommend that are less than 10 years old, cost less than £50,000, and are likely to be future...

Sixty grand tourer

I'm in the fortunate position to be able to spend £50k-£60k on a sports car which will be our third car and therefore used only as a treat. Ideally, I'd like to buy something that won't depreciate too...