I was just looking through my DS9 Technical Manual. According to that, the Miranda-class (as seen during the Dominion War) was armed with two pulse phaser cannons. Of the same make as the four mounted on the Defiant-class. I wouldn't mind that choice for any of my Miranda variants.
^ Learn something new everyday! as far as the Miranda goes. a refit version would be kinda neat. The original layout was seen with two pulse phaser banks. A weapon I'd love to see make a comeback from Star Trek 2. As far as the Spock Quote goes. If you remember the part where Kirk and McCoy had beamed back with Carrol and David Marcus. He stated that they had partial main power and were still inoperative in lower C-Deck. Which gave the Reliant an advantage in speed and firepower. If the Enterprise had gotten her shields up in time in the first encounter. Firepower wise, they would have been on equal terms.