For piracy because yarr harr.
Avenger Titan: (okayish) Fighter with a Cargo hold. Fast enough to chase down fat tasty freighters and a few tender buffs away from being a good dogfighter to boot. If the S3 Gatling ever got comparable DPS to other S3 weapons (or the option of an S4 fixed plz CIG I dont even have a penguin) it would be rad.
Work with some buds, steal and smuggle enough cargo to get into a Cutlass Black, which should be the premiere "small"/mid sized pirate ship of choice. Good dakka, good loot storage, and apparently with the rework good durability and reliable (if sluggish) handling. Sell the Avenger for a Buccaneer or Hornet if you need something with interceptor powers.
And honestly the Cutlass has enough room for growth too. Upgrade to a Blue for some extra armor and shields if you feel like it. Either way you got room for a pilot, co-pilot, and turret gunner, along with room in the back for six meat shields I mean Marines to board enemies if you get tired to grabbing cargo from broken ships.
From there I guess depending on if the Caterpillar ever turns out to be worthwhile get one of those, or just jump straight to the Big Boys League and get a Polaris. That's pretty much the biggest ship I would ever personally want to own, big enough to make a difference yet small enough not to need a dedicated task force of other ships to defend, unlike the Javelin and (possibly) Idris.