Maintaining the fluff factor... does that mean you will ONLY have stuff carrying icons?
I'm asking because Obliterators would be a better heavy choice over your havocs... one unit, at least.
I'm not too fond of the Khorne guys but what am I gonna do? It stays within your fluff.
As far as havocs go... good thought with the IoN. The toughness boost will help.
Have you thought about switching it up & making one an
IoT to see how the 5+
Inv save compares (and switching an
IoT troop to IoN)? Just curious.
I think your Slaaneshi units need power weapons/fists.
IMO, the Khorne should have a fist instead of P-Weapon. The extra attack from the Icon is a big difference when you're sporting a P-fist over a P-Weapon.
IMO, a
MoT would be better than Warptime on the Prince, too (not sure of points off hand, though).
I know you're keeping with fluff, so I won't tell you to change it, but keeping the numbers fluffy is hurting you. For the record, the preferred #'s don't really exist anymore (probably not until the new Demons or Legions codex... my $ is on the Legios codex, if they happen) so, if you choose NOT to stay with them you're not technically breaking any game fluff.
Still, though, I like that you're staying true to your idea.
Eric