[CedarZ4]

Agreed on the Hi-Fi Premium... However, I don't think PDC is a must. On such a small car (and especially since you're so close to the rear) parking shouldn't be too bad. Heated seats is a nice options, but again, depends on where you live. Also, in terms of retrofit, PDC is actually pretty easy to do... from what I know, iDrive is not retrofittable if you decide you want it later. Better save than sorry in my opinion, especially if you're having doubts.