I have been out of 40k for a while and missed many new codexes, with the new IG codex I'm planning to get in the fight again and would like to mix them up with some allies. But with so many books out there I have no idea where to start looking. So if anyone has any suggestions or could help me out, much obliged.
The idea is that the IG is my primary force so the army will hold more IG units than any allies. They provide bodies, and their good old "bang bang firepower" with tanks, specialist weapons etc. I'm also looking for another Imperium army so battle brothers preferably (gloria imperator!).