I agree with
RT &
CP on many things: combine marauders, split and strip the warhounds,
de-champ and mark up the knights

You also have a problem, as your Heroes are 260 points, 10 points over the 25% cap. Luckily I have a plan ...
Here's my thought. Note that this assumes that your models already exist as is (your warriors and your marauders have shields):
Exalted Hero - sword of swift slaying, enchanted shield = 150
Chaos Sorcerer - spell familiar = 100
12 Warriors - banner of rage, full command, shields = 257
20 Marauders -
MoN, full command, shields, light armor = 170
5 Warhounds = 30
5 Warhounds = 30
5 Knights -
MoK, standard, musician = 260
------
997
To make the points work out for your heroes, I demarked the exalted, with the intent of putting him in the rage warriors and gaining the same advantage (so a bit cheeky of me but

) The sorcerer lost his 6+ regen but gained a second spell, which is pretty vital to having a magic phase. Basically, with just 1 spell you're looking at IFing it - and 'it' will often be the signature spell! - or getting lucky in a dice off with another mage. Warriors swapped their mark for the Banner of Always Frenzied, the marauders were combined and the hounds split and simplified. The knights got angry too and lost their champ. Hurr!
If you haven't built any models, I would probably build your marauders with great weapons or flails, and think about giving your warriors halberds instead of shields. In the long run both of those builds will be more useful than shields (though shields are good on warriors, especially tizz ones, halberds are better on khorne dudes by far).
- Salvage