I was kindly given some of the old chaos Spaqce Marines by a friend so decided to paint them up as the infamous Alpha Legion. Notorious for the cunning and deceit, and the subject of many a meme, they look quite fancy in teal and silver. Also in the game lore they make extensive use Chaos cultists which is something that appeals. I also bought the commander from the Blackstone Fortress set seperately to go with them.
Within the squad I have a leader with power fist, a heavy bolter, a flamer, a standard and then a mix of bolters and chainswords with bolt pistols.
I thinking of getting a box of the fallen to convert and paint up in robes to play on their in universe nature.
Either way what I have now will make for a good Kill Team force.