Nice spec, you'll see my thread about a similar dilemma i had between cooper and cooper s where the s won for the same reasons you've discovered.
As for other bits (apart from jealously at the amount of toys you're slapping on it)....
I think the chilli red with either silver or black is a great colour -- drove a pepper white in test drive and it is great -- but maybe (say it quitely)...you'd feel a bit more ...erm, blokey in the chilli...(prepared to be slagged off on that one)
Im not a bit fan of full leather seats personally in general -- and looking at the spec you have already gone very dark on the interior so i think half/half will look best.
You could hardly add much more to your spec -- but im a big fan of heated seats...would never have ordered them before but bought a cherished with them on and now cant live without...
SO. ...as to stupid prices, since you're obviously not putting stripes across the roof, my dealer told me, when i was thinking about them, that if i waited to order post delivery, i could talk to the sign-writer personally about working out a deal between us for front and back vipers (which does seem sensible since you're not getting the longest bits of stripe!!!!!) You could try that to try to ditch some of the 200 quid they want!!
But otherwise -- great car, great spec -- and look forward to seeing the pics.,..congrats.
Forgot DAB thing -- have read on here that's it not worth doing -- can anyone else confirm that?