I am an Ork player, and I cannot decide what Elite choice to get, currently I have: 20 boy, 1 Warboss, 5 nobs, 3 deffkoptas, and 4 lootas with a mek

What elite choice would be best to compliment this army, is it:

a)Kommandos
b)Tankbustas
c)Burnas
d)More lootas
e)More nobs
f)Meganobs

I know what fast attack, hq, troops, and heavy supports I want to get, but I can't decide for the elites, so please, help me!