Worked my science officer up to captain with an Intrepid, which was pretty cool. Nice abilities, packed into a ship with reasonable maneuverability, great shielding, and generally nice to fly. Plus, I've got to say the Intrepid has a special place in my heart. Variable geometry nacelles are awesome.
But then, I started a tactical captain. Right now, I'm flying a Defiant-class armed with three dual heavy phaser cannons, a quantum torpedo launcher, and two phaser turrets. The forward firepower of this thing is so intense, it'd make Admieral Piett proud. Now, I'm finding it really hard to go back to leveling my science captain.