Toss up for me between Sidewinder or K7. With a Turret or two and Shield booster either can handle every space fight currently in the game with relative ease, then fill the rest of the space with crew quarters because waifus/husbandos are far more important than more ship stats if you ask me. (though you can also just use a cheatcode for infinite crew space and go nuts with your other upgrades)
Sidewinder comes with Olympia, but K7 has more crew space for the space harem and consumables storage for all those rainy day TFs.
That said I think I read something about the current ships in game largely being place holders until the real ship xpac so I'll just tack on a "for now" to these setups.