It seems like the way to start is to get:
2x Core set
1x everything else
That everyone pretty much seems to agree with. From here, what do people like to double, triple or even quadruple up on?
I was thinking of adding
1 more tie (for a total of 6)
1 more bomber
1 more squint
1 imperial aces (for a total of 4 squints) ... maybe 2 imperial aces for a total of 6 squints
1 more B wing
1 more Y wing
1 more Slave I
Do people run 2 A wings frequently? I am going to wait on the rebel transport to pick up my 4th x-wing.