If you're taking Splinter cannons as Corsairs, and you should be, nothing beats windriders. 75pts to move 12+ inches a turn and shoot 18 splinter shots from 36" out is a steal. If I were to match your wasps in cost I'd be putting out 84 or 90 depending on if you bought your wasps void burners.
It's unfortunate that Wasps don't have access to disintegrator cannons, as they would be a pretty ideal shock and awe platform. I like double scatter lasers but am routinely tempted to take starcannons. I should add that I do have a magnetized walker and never substitute anything for the scatter lasers.