Maserati GranTurismo or Porsche 911?

I have a 61 plate merc E220 CDI coupe 60K to exchange (worth 14K?) and want to spend up to 35K on either a Porsche 911 or a Maserati Granturismo, both available on about '08 plates. What would you recommend?

Buying a sports car as an investment

I have always wanted an Aston Martin and the V8 Vantage is affordable. I want the car to be an investment and to depreciate as little as possible. I have been offered an 18,000 mile 05 model for £43,000....