Once I've finished my 30K Iron Hands project, I want to paint some Thousand Sons. Their look was one of the first things that attracted me to 40K when I first encountered it, and the time couldn't be better with the new release.
The main issue for me is their shade of blue, which is more akin to turquoise from the American Southwest than the richer, darker lapis lazuli blue I associate with Egypt. The look I want is closer to the old upgrade pack webstore image or this Clint Langley illustration.
The blue I'd ideally like is this shade, more or less:
I'm hoping for some advice on which paints would be best. From the Citadel range, I think Altdorf Guard Blue would be the best choice, but I really have no experience with that part of the spectrum, or with non-Citadel paints, so I'm open to suggestions.