The cost of maintaining an older Porsche can be alarming! So I say focus on the newest cars possible. Also the tighter the track the less the motorsport improvements of an S matter. I've heard many times that the 2.5's sound the best. You can run 15" wheels on a base car and this may save $. Porsche made improvement to these cars every year- need I say more? Your idea sounds good and will probably sell Porsche's! Maybe you can work out something with THEM...like 3 spanking new base Caymans!
