Which car do you prefer?

Of the cars you've listed I prefer the BMW 6 series. However based on the cars listed and maintaining generally the same price tag I'd go with a 2005-2006 Maserati 4200 CambioCorsa Spyder or Coupe'. They are an Italian exotic, made by Ferrari, uses a Ferrari engine block, produces nearly 400 hp, has greater luxury than any thing you've listed, maintenance cost are much improved over it's big brother (Ferrari), and produces a real GT feel and sound. Also if you go with the CambioCorsa it will have the F1 style paddle shifters and the car looks great and has outstanding performance. Just my two cents.