Lord of Chaos Undivided
Black Maul, Gaze of the Gods, Enchanted Shield, Mount

Aspiring Champion of Tzeentch
Battle Standard Bearer, Mark of Tzeentch, Dispel Scroll, Sword of Might, Mount

Level 2 Sorcerer, Power Familiar, Braystaff

Level 2 Sorcerer, Dispel Scroll, Darkoth Staff

5 Chosen Knights of Chaos Undivided
Full Command

5 Knights of Chaos Undivided
Full Command

5 Mounted Marauders
Flails, Shields, Full Command

5 Mounted Marauders
Flails, Musician

Beast Herd
5 Gors, 11 Ungors

7 Tzeentch Screamers

3 Dragon Ogres
Light Armor, Great Weapons

Cannon (Dogs of War)

Power Dice 9
Dispel Dice 6
Unit Strength 81
Models 54
Units 9 counting command

So here's my question: What should I do with my battle standard bearer? My basic ideas are as follows:
1. Scrounge up 20 points and give one of my units of Knights the Mark of Tzeentch. If I do this, should I make the chosen or the regular knights tzeentch? Obviously my general will be with the other unit.
2. Run him with one of the units of marauders.

What do you all think? Also, how about the army in general? Any tweaks or changes you would make? Think there are any armies I'd have a big problem with?