I'm thinking either straight up 6x Sigma Squadron Phantoms,
OR
5x Crackshot Black Squadrons, and then 3x Sigma Squadron.
OR
4x Crack Squadron, 2x Sigma, 40 point Whisper.
6x Sigma has that "Oh **** I've lost already, this guy has 6 Phantoms" factor, while the second list actually seems more effective. 3rd option also seems good.
I do not have enough Crackshots to do the full 10x Crack Squadron unfortunately. Due to the weird way I traded to get my some TIE Fighters I also only have 8 Black Squadron ship tokens despite having 10 TIE Fighters. I do have 6 Phantoms though.