I went with Lava out of your choices, I have had Audis in Metallic blue, Denim Blue, Moro blue, Ebony Black, Akoya Silver and at the moment Aqua Blue which I love, it is sort of a Steel blue/grey and quite dark.
But out of al those I have liked the Ebony black the most, and on a sportback with the alu rails I think it looks awesome, but Lava looks good too.