Hi, this post introduces an army I had wanted to start for a while, and when I finally decided to, I found them brilliant.
Yes, I gave in and started a marine-based army, but decided instead of the conventional black legion or alpha legion, I would start one of the extremist legions.
Both I and Titan-Zach, along with any other chaos marine players out there know the good feeling of having perks in your standard troop choices that normal marines dont get...
whether thats Thousand Sons giving you AP3 bolters, a 4+ invulnerable save and an aspiring sorcerer in every squad with a psychic ability of your choice, or Plague marines, with feel no pain, and toughness 5, or Noise marines, with access to all sorts of long range, good AP weaponry, or Khorne Beserkers, with fearless, furious charge and 2 attacks, +1 for having two one handed close combat weapons.

I plan on having a purely thousand sons based army, with no gods other than Tzeentch used for abilities, and general units etc... (the other gods aren't gonna be too happy when they read this).