Fighter: Defender
Bomber: Don't have one as of now
Freighter: Kestrel
Transport: Armored Transport
Gunboat: I'm in the mood for an Inquisitor
Frigate: Raba
Cruiser: I have yet to find a cruiser I favor
Battlecruiser: Have not found one I like entirely.
Battleship: Liberty "Overlord"-class Dreadnought, it's design and abilities in the game is one of the reasons why I'm into the Discovery mod. (Also, I'm in love with said ship)