Wow ... where to begin
Ok, so it looks like you are playing a World Eaters-style army, so why not just make them World Eaters?
That being said - 8 man squads of Berserkers is the way to fly. That's Khorne's favoured number, so you can get free Aspiring Champs for your marked squads.
Also, your force isn't valid as it doesn't have two troops choices.
Kharn is a bad idea. You can build a nasty glave prince for fewer points and you'll; have a much more effective unit.
Termies don't make sense in this otherwise fast-moving non-shooty army. Ditch them for more berzerkers or some bloodletters.
If I were to put together a similar list it'd be
Daemon Prince -
MOK, Glaive, Feel No Pain, Stature, Essence, Resilience (really, just flavor to prefrence) - 160pts
2x - 8x Berserkers,
MOK, Chainaxes, Free Asp Champ - 160pts each, 320 total
480pts so far.
That gives you 270pts to add in a vehicle or two and come up with some anti-tank (pfists/daemonic talons +
str on the berserker champs, make your vehicle choice stocked with some melta/las options)
Heck, a Dred with Twin Linked LasCannon + Pred with Twin Linked LasCannon + Las Sponsons = 270pts on the nose