Get the lightweight seats fitted - they go lower, plus they are more comfy and supportive... This is not the cheapest suggestion you will recieve however
I was keen to try them, plus the Alcantara wheel. I booked myself on the 1 day PDC, but to my disappointment, the v12v I drove didn't have either (a great day though).
No plan to change the seats though - unless there is someone out there that wants to swap!