One defining decision is do I go modern or stick with the classic look?
Here's a fairly classic look GD snapped at Stoneleigh a few years ago.
And then to something much more modern, its not a GD and it has side pipes but I kind of like the look of this car.
Not so sure about the interior colouring but the switches are modern and the rest is basically its a choice between big (18" front and 19" rear) or little (16 or 17") wheels.
Maybe traditional is best though.