I've been using bits from all over, and some of the new Space Wolf stuff is just too awesome for words, especially the arms that are hefting Boltguns single handedly. But what to put in the other hand? Chainswords of course!
Everyone who is not wearing a helmet has it attached to his belt, along with a ton of other equipment. Still sticking with Rogue Trader packs as well as another of Secret Weapon pack to boot. I used the one Dark Angel pack because it has a pretty cool skull atop it.