Just a comment on power-adjustable lumbar support - Went without it on a 335i w/ sport seats, then with it on a M3 w/ sport seats, and would never go back to not having it. The fact that you can change it up is very very useful, and the movable area is huge.
I was quite surprised how adjustable it is. It literally moves half a foot up/down and the in/out adjustment is cushy and significant.
