Overall, looks pretty good to me! Here are my quick thoughts:
First off, do you want to keep sleeping with people as the 'special move' for this game? Nothing wrong with adding a bit of sexiness to the usually sterilized for young adolescents world of 40k, but Vincent pointed out in some earlier post that the sex isn't an integral part of the game unless it's significant to the world you're playing in. I can't really think of a more 'Rogue Tradery' thing to take over its importance, but just a thought.
Next up, on the weapons. I agree that they seem to be a bit in the high power range, but that's without seeing everybody else's standard weapon choices. The main thing that stands out is that there's only one 2-harm weapon even available to the Arch-Militant, and he has the option of taking a 4 harm +1 harm weapon or the 'insta-super-messy-death' weapon, whatever it may be. On the other hand, high value armor might be way more common since 40k types tend to run around in more and better armor than your average wasteland dweller. Unless you already have firm ideas about what weapons should be 1 harm and 2 harm, I might consider trending all of the weapons down by 1 harm, especially if you keep the 'lethal' option for an upgrade (oh yeah, and in a battle, when paired with "Death World Veteran" you could have a totally bonkers Arch-Militant running around inflicting 6 harm on individuals with a lethal upgraded plasma pistol or melta gun. Youch!).
But, if you want Arch-Militants to be totally, ridiculously lethal, then keep it the way it is, cos it's fun to mow through hordes of your lessers!