The great thing about this game is the huge amount of variation and customisation available in builds. I know the the Tie Advanced is over priced for what it brings to the table but some of the fun in playing casually is trying things out.
Here is a squad I'm thinking of runnning over the weekend and the only non negotiable is that it MUST include Vader Tie/Adv. As yet I have no wave 4 stuff and 1 Firespray, 1 shuttle, 1 bomber, 6 ties and 4 interceptors.
Darth Vader tie/adv - 29
Expert handling 3
Concussion missiles
BH with ion cannon and gunner
RGP with swarm or squad leader (for helping out the BH)
I've a couple of variants with low cost tie fighters in place of the RGP.