The way the fluff is now, there's no real issues w/ running multi-god armies. I do it all the time. Sometimes even running all 4 marks. Daemons are the ones that have issues now w/ running differing marks for purposes of who can use the BSB. You could try running an unmarked sorcerer w/ Death or Metal (Khorne HAS to like death-metal!! Right ... ???). Death for sniping characters & unit champs. Metal is a bit more situational - better vs hi armor. Otherwise, Shadow is all about the hexes to the opponent plus you could get Mindrazor and give your troops S8 attacks! Fire if you want a bit of ranged support to help thin the enemy lines. Fireball is always handy and a lvl 2 can cast the 10+ version fairly reliably on just 3 dice ... unless you're me in which case you fail 10+ on 4 dice regularly.
If you're going to be playing larger games where there's a good chance your big lord/hero on jugger has a chance to get sniped by a cannon, then, yes, go for the 5 crushers. But if he's that important he should have some type of ward save - Armor of Destiny or Talisman of Preservation.
If you're going to be playing larger games where there's a good chance your big lord/hero on jugger has a chance to get sniped by a cannon, then, yes, go for the 5 crushers. But if he's that important he should have some type of ward save - Armor of Destiny or Talisman of Preservation.