Hi, I'm Graduate from Pepperdine University the year, What Car should i Get?

I'm graduating from Pepperdine University in a few weeks, a month ago i was offered a job making $80,000 a year and i accepted it. I'm currently deciding on a new car. I'm planning on trading in my 03 BMW M3, for either a 07' Porsche Cayman or a 07 Cadillac XLR. What are the pros and cons of these choses? I'm also considering an Infiniti M45 and Lexus GS450