Oh, and squirrell, you're preaching to the choir about red. What I do is just use the Foundation set red, and then a couple coats of blood red, and it comes out nicely.
I tried that. Its darker than the stuff i did years ago (which will be kind of amusing, but i suppose not a big problem). I'm actually liking the following a little better: drybrush on deneb stone, followed by a drybrush of blood red, then red ink followed by a coat of blood red to bring it up again. Nice dark red sunk details with a decent blood red color.
Then of course its time for highlighting, which takes like half the time i put into the model. The problems are two-fold: (A) I really dislike 'eavy metal style - its basically edging and doesn't look like a light effect at all. I'm a much bigger fan of something closer to a 'painterly' shading. (B) Taking blood red up to something near blazing orange at the light focal point and doing it well requires time and lots of wet blending. And there are a surprising number of relevant surfaces on a marine with a jump pack.
Of course, for the non-HG assault marine (i'm not cool enough for NMM yet, so the HG model just got metallics on his helmet), the helmet also needed shading. And if any color takes longer than red its yellow. In addition to having to basecoat it white to get the yellow to even cover well, it took like 1.5 hours to shade the darn thing.
As mentioned, these models are going to combine... interestingly... with my older models. I wasn't being especially attentive to shading or anything fancy at the time (years and years ago), and then spent time painting non-40k stuff where i experimented with various techniques when i painted at all, and am continuing to experiment with them on these models. (Fantasy miniatures don't tend to have large flat 'colored' (non-metal) surfaces - makes shading trickier for marines actually.)