Made a post last night but it did not take. Lets try again.
I have Carbon Black, Caramel all leather with Buryee wood. Very happy with it, the spouse is as well.
I think either wood works. I ordered the walnut thinking it would give some transition from the black parts to the caramel. But my car came with the Buryee - first pointed out by Anzir. The buryee match with caramel is extremely good.
Caramel/Buryee & black makes for a two tone int. With Caramel/Walnut & black, there is enough wood to make it a three tone interior.
Anzir, how is it going. Sadly, I will be driving the M5 less. We are getting some winter weather here in the midwest though not as bad as some places. 6K mi with no problems.