If you were spending between 50 to 60k which would you pick - Mercedes C350, BMW 335, Audi A4, Infiniti G and any other suggestions excluding any front wheel drive models. Also if you were spending 80 to 100k what would you pick? BMW 550, Merecedes E550, Lexus LS460, Audi A6 or perhaps a used E63 Mercedes or BMW M5? Just curious?