So starships seem to have come a long way since I used to play back in 4.x and early 5.x. We've got Mk IV's and V's, and even the lower mark versions seem to pack more punch than they used to and hold up better. I must admit that back then, I generally only spent knowledge on fleetships, never starships, but these days that seems like an unwise policy. I'm wondering which starships folks think are worth spending some knowledge to unlock higher marks for. Obviously this is going to be somewhat circumstantial, but I'm just trying to get a sense of the "general consensus" of what's worth having.
For my part, my first couple of games back I've unlocked Mk II and III (and thus IV) flagships, which seem to earn their pay munitions-boosting the fleet to new levels of lethality.