First car: Peugeot 207 Cc, Mazda mx5 nb, Opel Tigra Twintop experiences?

Hello, I've been driving accompanied for four months, and since I'll be turning 18 soon, I'd like to buy a car in the €3,000-€4,000 range. As mentioned above, I really like the Peugeot 207cc, Mazda MX5, and Opel Tigra Twintop, and I'd like some help in making a decision, some tips, and some opinions. Thanks…