I play against Orks alot, particularly Orks who looooove Power Klaws. Something I've come up with to counter 30 boys 'Ard Boyz squad and 10 Nob Nob Squads with a Warboss is such. Land Raider Crusader, Carrying a unit of 10 Vanguard Veterans, two have power weapons and another 2 have storm shield. Attached is a Captain equipped with a Relic Blade and Storm Shield (Converted from a finecast emperor's champion with an Iron Halo on the backpack and a shield from some old 3rd Ed fantasy Beastmen). This particular setup has me removing the ranged capabilities of the captain to make him a beast in close combat. This setup still very reliably takes control over whatever section of the board I drop it on.
Future plans for this involve adding the 5 man command squad and swapping out one of the vanguard vets for a chaplain. 9 Vets + 1 Chaplain + 5 man Command Squad + 1 Captain hits the 16 man capacity, taking advantage of the increased transport capacity of the Crusader.