Here's the ideal. 6 man squad of Raptors, Icon of Slaanesh, 2 Plasma Pistols and champ with twin Lightning Claws. Used to Deep Strike, hopefully near cover, to pounce on any infantry caught out in the open. Tell me what you think! (Thanks to Lord Commander Erus, who reminded me that 6 is the sacred number of Slaanesh, as I was going with a 5 man squad with no Icon.)
