Went through similar thought process but for me (and my rear passengers) I felt warmth in New England Winters was a priority. I had a heated steering wheel in my 7 and really miss it. Heated rear seats will keep our friends comfortable. As far as lane departure, etc,... I guess if I can't stay in my lane, I shouldn't be driving
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2013 x35i (Space Gray, MSport, CW/CWII, DHP, Premium, Premium Sound, Technology, BMW-Apps)
Retired: '09 C300 4Matic, '09 GTI, '06 750i, '05 C55, '04 R32, '03 M5, '02 GTI, '01 M5, '00 M-Coupe, '00 540i/6, '99 M3 Coupe, '98 M3 Coupe, '96 328i,... '86 4000 CS Quattro... too many to list.