What I mean by "non-basic" is something that's not like Electronics V or something that everybody trains, but something that you train up later, and never really have to, but never regret cause it just keeps giving. Nothing that's a prerequisite for a standard T2 fit like Gunnery V or Missile Launch Operation V etc.
Suggestions of mine:
- Battlecruisers V (eight ships benefit, three or four of which are awesome and cheap, I didn't train it to unlock Command Ships either)
- Heavy Assault Ships V (eight ships benefit, a few of which are great)
- Covert Ops V (eight ships benefit, bombers get huge bonuses from each level)