I just took delivery of the same X5 as you are contemplating.

Agree with JCL, comfort seats are a must, as is cold weather if climate applicable. Also agree on comfort access, but you could live without it. If you are going to get comfort access, just get the premium package - you'll appreciate the backup camera.

I have Adaptive Drive and am absolutely sold on it. I also have M Performance. It's not a lot of money - I thought 'why not? She moves right along and sounds great - better than my M.

Dinan is 96hp and is $3k. I understand there is only a stage 1 available.

In my opinion, and coming from an X5M, I don't think you could tell the difference between 444hp and 496hp. I can barely tell the difference (acceleration) between my current 50i MPerf and my old ///M.

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Go 50i or go home