Well, let's look at the candidates suggested here:
Prometheus Class

Arnament:
18 Phaser Arrays
5 Torpedo Tubes
My Opinion: An Intrepid on steroids. The splitting into three is the nice feature here. Probably the equal of the Retrofitted Galaxt in battle.
Akira Class

Arnament:
3 Phaser Arrays
15 Torpedo Tubes
My Opinion: Looks nice, but too close the the Miranda and Nebula class ships. Powerful, and with a carrier capacity. Bit light on phaser power though.
Retrofitted Galaxy Class

Sorry about the two pics, had to get a view of both the modifications.Arnament: (Note: Speculation)
1 Heavy Phaser Cannon
16 Phaser Arrays
3 Torpedo Tubes
My Opinion: That phaser makes the ship worthwhile, and is a very good compliment to the transphasic torpedos. Pierces the shields of enemies easily. Also, a nice set of phasers. In addition, it mounts a cloaking device.
All information and pics from the
Daystrom Institute Technical Library.
EDIT: Forgot the cloaking device.