I have the medium slate interior. Personally I can't stand an all black (or charcoal/slate)interior....I feel like I'm in a coalmine LOL. Shows alot of dust too. And...this is just my perception...an all black interior looks cheaper to me than one with contrast. I don't know why I feel that way. The silver trim of the X-fire does eleviate much of my issues with the dark slate.
I think the vanilla color, of the roadster pics we've seen, looks great.
I do think the cedar and vanilla colors would be more practical without the steer wheels being the same color.