Honestly I would wait and ask them regarding the black interior, you don't want to spend the money on something you're not entirely happy with.

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I have Ash interior. You definitely have to keep up with cleaning regiments else they will become darker in color. But normal leather cleaner is all that's needed.

 

I was in the same boat as you, but settled with Ash int/Black ext. I'm glad I chose the Ash - I appreciate the lighter interior and would choose again. Wife's car has black interior, and it seems so dark inside. I have kids who insist on stepping on the door sills, and putting their feet on the back of the seats - but they clean up well.

If floormats are your hang up though - check eBay. Plenty of factory OEM sets on there - you could buy and sell yours. I'd actually like a set of the carpet mats for the summer months, but really appreciate the rubbers in winter.

 

I have the ash interior and like others have said, it'll become darker especially the driver side. Clean it with a leather cleaner or just use 303 aerospace spray. You can also get a leather brush if you want. The black seats do the same but its less noticable than the ash interior.
I'm happy with mine. My driver seat is darker than the other seats but.... thats just the nature of the beast.