Farsight and Invisible Stalker Work well together. About 3 or 4 invisible stalkers can take out 6 mindflayers (they're immune to the "devour brain" ability they have). The only prob with this is the umber hulks can mush em before they do they're job. So for the hulks use a few cloud kills to take em out (while farsighted) and then take out the flayers. Cloud Kill wont kill the mind flayers because of the magic resistance (like 90%). Use Caotic commands if you want to resist the charm of the flayers but using my strategy above you wont get close enough to need to.
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ShadowMaster of the Theives of Darkness.
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