Saw this one coming a mile away, congrats man. I never see this car as a convertible. Don't think you could have found a cleaner car in better condition, nor kept up like that, with all those records. Talk about buyer confidence.
A guy I work with is a BMWophile and when I told him I was looking at 335i's he said that you need to make sure to get a certain year and up (I think it was 2009 but I forget), because the earlier models had electronic steering or electric assist, which is what makes the steering feel numb. But I think if you get the M-sport you get an M steering rack anyway so it negates that. Just something interesting I learned.
I'd be interested to hear some of the quotes you got for the e46, still my favorite M3 of all time. If that's personal, no biggy. Congrats again!