well mine isnt a good comparison, my grey knights are gunmetal grey, with some mithril drybrushed, and then a million coats of baal red wash until they are sort of a metallic red/purple.
then I do all the details, the runes all go bronze, the seals and book are white with then brown wash overtop, ect. ect.
here's what I do for my admech models.
Black prime -> drybrush mechanite red heavily over the model -> wash heavily -> drybrush a tiny bit of red overtop, end result is this:
http://images.dakkadakka.com/gallery/2010/8/24/133188_sm-Mech%20Infantry%201.jpg
you have the black base coat showing through in deep recesses, most of the model is the dark washed red, and the very edges become unwashed red and highlight a little bit.
Its the easiest way ive figured out to get alot of depth from my models, please note though that I suck at painting and have been improving dramatically lately, but a golden daemon is nowhere near my future, ever XD
my grey knight is here, on the left incase you wanted to zoom in and see my paint scheme (i can try and take a better pic if needed)
http://www.dakkadakka.com/gallery/152068-Mechanicus%20Elites.html