Adnan, prvo pozdrav iz hladnog i maglovitog Zagreba. Nadam se da ste familija i ti dobro?

Second, rear seats-a must for your wife? If not, then the choice is easy-either Boxster S or forthcoming Cayman S(I am pressuming that she want new Cayman S?).  In drive dynamics Porsche's are clearly in their own class. They are also pretty suited for daily use.

On the other hand if she plans to use it all year/all weather then Audi S5 Cabrio do make sense IMHO.

Price wise you know situation in Germany far better then I do-ragarding which one is better for rebate etc.