Laguna Seca Blue is essentially the same color as the S4 blue.
Doesn't look like it in the latest M brochure. LS Blue seems to be a non-metallic powder-puff blue. Ugly in the Photoshop job in the brochure, probably worse in the sun. Audi S4 Nogaro Blue is darker, hope something like that (LeMans Blue?) is available or else I'll probably take silver.