Haven't read all of the comments, but I'm just going to pop in to say that I use a squadron heavy mix of new and old. Fireball with Dengar, Mithel, and Vader. Mithel can be a crazy monster against squadron heavy opponents. My cousin rolled poorly in the squadron game last week, and my Mithel probably did roughly 20 damage with his 360° mega shotgun of killing everything. Vader gets sweet-ass counter from Dengar (but excellent damage on his own, as well.)
R+V are good for sure, but so are many of the Wave 1 squadrons. Find what works for you. I pay the ludicrous extra money for Firesprays, but that's because single black bomber dice for me have 4 blank sides, and 3 single hit sides. They're terrible.