Whats the best sports car or a head turner to get around 20k?

I'm 18 and I'm thinking about getting a car soon

Some of my picks
Porsche Cayman 2007
Cadillac XTS 2013
Cadillac CTS Coupe 2011
Cadillac ATS 2013
Dodge Challanger 2015
Mustang Eco 2015
Camaro 2015 RS
Ford Fusion 2014
BMW M6 2006
BMW X6 2008
Audi A5 2011
BMW 3 series 2013

What would you pick if you were me and why
Can recommend other cars too:)

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