Thanks for the adviceHi Mark, and welcome to the forum.
It sounds like you may be using an E86 for track days so you probably want to find a Sport model as they came with much more supportive M-Sport seats, which were an option on the SE. Anyway good luck finding the right one.
I would only track day it very occasionally and would mostly use it on the road so would prefer more of a GT feel. The auto and it's paddle shift is a good blend for me, have decades of similar use on my 530d and previous 335d.Welcome
While the BMW 3.0 diesel is very good, I agree, you need help if you are using that as a fun car!
An E86 on the other hand, is a thing of beauty
Any particular reason why you want an auto? They turn up on here every so often, so if you are patient, you will get a good one.