It all depends on what works for you. If your not going to drive over 10k miles a year then it's probably ok. I don't know about the exact numbers on a 7, especially a new one. Just out of curiosity and because it would save you a lot of money in the long run have you looked at the previous design (E65) or are you set on the new one (F01)? Maybe even a used F01? They started making them in 2008 if I remember correctly. Whatever you end up doing congrats!
Current Scores: TU 746, EX 755, EQ 724