What month/year did the new iDrive system arrive?
I know this sounds a bit odd but in some ways I prefer the sleeper look of the SE compared to the M Sport which is probably a good thing because all of the M Sport 335i's I have seen have been out of my budget or high mileage.
Meh get the £350 BMW Aero front skirt and blacken out the bottom grilles and you have a front end which looks better than an Msport IMO.
The 335 comes with all the good M Sport bits(seats and suspension) regardless of trim level anyway!