Hi Steve I like your string of cars, my favourite porsche at the moment is the cayman GTS even tho I can never bring myself to actually buy one. I think you're really going to enjoy the 575M and that monster torque that comes with the big V12. Very nice combination too.
Current Fcars: 360 Modena
Gone but not forgotten: 360 Spider, 575M, F430.
Other stuff: '71 Holden GTS Monaro, '80 BMW Alpina B9, '74 Porsche Targa, Caterham, MB CL500, Land Rover Discovery.