Yeah, on my Tie Fighters and Tie Advanced X1 I used XF-82 and XF-18, but I did not have any XF-82 on hand. Plenty of medium blue and other grays, so I just mixed until I matched the color of my Tie Fighter (pictured in the OP).
I'd love to pick up all of Guy Cowen's Archive X paints, but they are soo expensive. And they're enamels... But I'm so use to using Tamiya acrylics that I might have to get use to a new paint type. Or maybe not.. Either, the cost is a turn off at this point. Besides, I think I have a good eye for matching the colors of the studio models.