Simon... I only have Californina/Nevada Map1 and Southwest/Northwest Map2 discs. I did order a severly outdated NavTech disk #7 (not labeled as Porsche) for the Southeast from ebay for $15. I hope it works, will let you know...
As far as what features I really like... the full leather dash and upgraded steering wheel, plus the fact that it's a coupe with the special color.
The previous owner's other ME car was in similar condition, but without the seat repairs. And it has 5k less miles than mine and no added-on carbon fiber deck spoiler. Otherwise, it looked identical. I didn't get the number on his as I was preoccupied with mine.
I have pictures in my phone, will get them transferred to PC and add to the thread soon.