Board Thread:Warhammer 40k General Discussion/@comment-2253300-20140511200137/@comment-195.43.156.30-20140512080953

Night Lords wouldn't be a bad choice, if you look at the wiki:

"The thrill of battle does not concern them as they often bypass able foes, instead attacking prey too weak to resist and ruthlessly hunting down all before them."

Plus their presence sows terror in the hearts of the enemy, which gives quite an advantage from the start of a battle. Plus:

Nostraman became the language of the VIII Legion, its curling runes and sibilant words spreading as Nostraman recruits began to include a dark and cruel sense of humour, and a snide fatalism

Dark and cruel it may be, but hey, it's still a space marine legion with a sense of humour, and that's something you don't get often :) Worth serving under in my opinion :)

The Thousand Sons are also an interresting choice. Fighting more with brains than muscles. Though the risk of one of the spells suddenly going wrong is a bit much ;)

Of the loyalist ones, I guess the Imperial Fists would be my choice, for the reasons mentioned bySupahbadmarine