Thread resurrection.
Right now I'd get one Interceptor and wait for the Imperial Aces pack. I'll admit I'm not sure if it has all the low skill pilots in it but with Interceptors you're often looking at the more skilled pilots. Aces also looks like it will have much better upgrades including a pair of Push the Limits card. That Elite Pilot skill is another reason a person may have wanted to get more than one A-Wing as they are awesome with many ships.
From wave 3 the recommendations are usually one HWK and Lambda and then some number of the fighters. Generally not more than 3 B-Wings although some of the more popular upgrades for them require other ships (Shuttle being the most likely) but with TIE Bombers it is up in the air. You may want on for Jonus who can help everyone else's secondardy weapons but when you run Bombers for bombers you generally want two or more; some interesting lists have four but by dumping ordnance you can run Bombers as a swarm instead.