Randy, with silver being my favorite color on the coupe, I'm kind of partial towards this paint color. All the sexy lines and curves of the coupe just simply flow together better with the silver painted CS.
Personally, I would not recommend changing color from the original paint. Unless you're planning to completely respray the car both inside and out, this includes the exterior, complete interior repaint, the engine bay, and the trunk. Unless you're undergoing a complete restoration of the coupe where every conceivable part is removed from the car, then there is no practical way to access and paint all the various parts of the car, especially all the crannies and crevices of the coupe.
The schwarz color is supposed to be black. How were you shown a anthracite grey paint sample? The paint code of schwarz is 086 and for anthracite grey is a combo of 055/098, I assume there are two different shades of this color. This color info was extracted from the
www.bmwcsregistry.org link.
Silver colored cars have become way too common in recent years, from econo boxes to luxury coupes, but your CSi with a gleaming new Polaris silver paint will simply look stunning and will attract admirers with positive comments everywhere you go with this timeless car.
These are just my humble opinions on this matter. Choose whatever colors that suits your fancy Randy, Can't wait to see the finished car.
Bert
72 3.5 CSi
88 M6