Ive been reading up on it and I think the best option for myself is to:
Max out on both types of gaunt and use these to rush the enemy quickly and tie up squads at a time.
Then behind the gaunts come the genestealers which are slower, but do crazy damage. Because the squads are tied up these shouldn\'t be targetted and will probably be underestimated.
To further this effect Ill bring in a Tyrant and a Carnifax (both with guards). These can deal out some damage, but will also distract the enemy from my genestealers. Average player with a big tank is probably going to shoot the tyrant rather than the genestealers.
Finally Ill deploy a Lictor to keep them guessing and ambush any heavy weapons squads.
Once the genestealers hit (prob 2 squads of them) its goodnight

. What do you think?