You'll want to soup up the 911 Turbo Cabriolet by this company, as the base price is just $136,500
... $160,250 base price, and you're well on your way to the $189,150 Turbo 
S. [DOC] [TLE] A Perfect Porsche: the 911 Turbo Cabriolet - WSJ [PAR] May 15, 2010 ... Porsche has done just that with the 2010 911 Turbo Cabriolet.