Ok so the top picture isn't acutally a traitor force, but it is my complete (as it stands) 30k Ultramarine force.
With the new Edition I am going to be aiming for a second force, definitely traitors to give me some flexibility in my games.
At the moment the main Legions I am still considering are:
1. Iron Warriors
2. Sons of Horus
3. Alpha Legion
I did consider the Nightlords, but the more I have read up on them the less I am interested at the moment.
So still working on deciding this! The image below I nabbed from twitter though, and I am posting here for when I am playing a game and some neckbeard tries to tell me that I shouldn't have MkVI armour sets for my legion.