Even more speculatively than the others, because I don't even hold a driving licence:

1) Jaguar E-Type convertible
2) Peugeot 206CC (I don't know what it's like to drive, and those vents in the bonnet make it look terribly aggressive, but I like the basic idea)
3) Rolls-Royce Phantom II Continental cabriolet
4) That Fiat thing a bit like a miniature MX-5, can't remember what it's called
5) Anything made by Caterham

I saw an all-white example of no.3 parked somewhere once, and it looked amazing. Not sure about the 40hp, 8 litre engine though.

Peter