Why not just order X51 - it can be dealer fit to your 997S when it arrives. Also you can order the aerokit if you want the looks too - if not stick with the X51.

a 997S with X51 and -20mm will be the very next best thing to a GT3 and has lots of other benefits to boot - most noticably 2 rear seats and decent sound system. Surely this car would be a better compromise to somebody who originally fell for the 997S.

For me a GT3 is too hardcore not matter how superb it is to drive. I drove a GT3RS on my recent millbrook day and there is no doubt about it, the car is awesome - but its the GT3 I would be getting bored with not a 997S. Yes day1 I would be blown away but its hard edge would grate upon me in time leaving me wanting the dual personality of a 997S / X51.

Stick with what you have and go with X51 - save you lots of cash instead of walking away from the 997S deal, and you will be in a car so much sooner!