Vader VI EU ATC
5x Obsidian.
It's a nice squad. Veteran Instincts on Vader does make a hell of a difference when combined with his nasty stressless boost/barrel roll options, and one thing I've learned with my games is that TIE swarms eat twin laser turrets alive. Six TIE fighters should be able to focus down a Y-wing before it can shoot.
You've got the block firepower for Y-wings and non-boosting big ships, the blockers for boosting big ships and phantoms, and the nightmare of an ace for solo dogfights.
I'll have to try this myself.