When you say anti-ork?
Is it Mech ork? because if it is, i think you have a fairly decent list (although i'm not sure the command squad is necessarily worth their points, blow up a BW, something gets out and kills them... (probably)
If their more geared towards horde, then you need Land Raiders

They find it so hard to kill them, best chance they have is to stun it, and then not have to hit it, because needing 4/6s and then a roll to pen really does make it hard (unless 4/5
PKs charge you...)