Couple of small pointers:
Usually champion upgrades are questionable especially to ogres & knights as they don't achieve much getting only extra attack for a lot of points, so I'd skip taking the champs for ogres and knights, they are hitty enough without them. Another thing to remember is that you require 5 models of pure* r-n-f to gain look-out-sir vs magic & shooting, so you better take 1 more knight to keep your lord safe from (at least the 1st) cannonballs etc..
*champs won't count for
rnf in this, so you need 5+champ to get look-out-sir for champion and additional characters in 7th ed, or just 5 models for the additional character.
Naked marauders are just pants, better take them with light armor and shield for good protection, so they stand a better change of actually winning combats.
Couple of extra warm bodies would help (unit size 25ish), so they get to keep full rank bonus even after some shooting/magic casualties.
Chosen upgrade would benefit the knights greatly, altough you could probably do without if you stick your lord in them. In any case, give the lord a shield as 1+ save is great. For points you can downgrade the great fang to sword of might, as it wounds tough stuff easier, and gives a hefty minus to armor saves.
The Khorne warriors would benefit a lot for shields (at least), as they really need the good save, and if you got points, get them halberds for example, so they can kill stuff a bit easier. A great but a bit pricy addition would also be banner of rage for them, as both it's qualities will help the unit work as an anvil which it often may be.
One general thing to consider is that infantry armies will benefit a lot from battle standard beares, so if you can squeeze in one, it would help a lot in certain circumstances.
To get these or some other extra thingies, you may have to drop one of the more expensive units such as Shaggoth or Ogres (both which are pretty medicore choices. The shaggoth model is pretty nice, though).
