I have a few teams of 3-6 snipers with the Athena paralyzing sniper rifle and a few assault rifle troops for worm/mindfragger defense.
Its probably the most hilarious set up ive tried yet. Its so over powered it makes every mission a 1-3 turn cakewalk. Im trying to train up some infiltrators for ultimate stealth endless stun build but this works like a dream! I stunned a Scylla in 1 turn and got the rest of the enemy team the next.
The snipers are pretty expensive early on but totally worth it.