996 turbo buy standard or modify to suit?

[996TTSLondon]

First time post, but would welcome your wisdom

I am looking for a fast and loud 996 turbo cab (if you are selling please message me). I could buy a 996 turbo and uprate it to turbo s spec and add a noisy exhaust from http://www.nineexcellence.com/ or maybe http://www.speedtechexhausts.com/page34.html or I could wait for a real turbo s to turn up on the market.

As they say, a nice problem to have, but this will be my first Porsche having had an M3 CSL and a Honda NSX so it's a brave new world for me.

Thanks in advance