I think the 3rd series that was auctioned two years ago in the Palmen Collection in Holland was Avorio. I found it a very nice colour, and had an eye on the car. It went however less engine and transaxle, and in a very poor, rusty condition, for a staggering 54.000 euros; which was including taxes and expenses 63.000 Euro, a bit too much for me...
That said, the blue celeste is also a very good colour!
Is there any formulations known for 4th series black?