This build with plasma accelerators and missiles may lean a bit too heavily towards damage ( I don't know your entire loadout I'd be interested to see the internals).
With my essentials A rated (thrusters, Power Plant, Power distributor, FSD,) and others B or C as needed (C rated shields), I outfit with 2x C1 fixed beams and 2x C2 gimbal multi cannons. I use about 11.8/12 KW
My ship weighs about 114 tons (reinforced alloy, not military grade which is too heavy), which keeps it zippy with A rated thrusters with optimal mass of 120tons. I have a fine balance of speed, maneuverability, defense, and damage output.
This is all my own humble opinion of course. I've done quite a bit of combat with this build against every sort of NPC ship of all combat rankings. PVP i haven't met a real challenge but that is largely due to scarcity and every player I've met is harmless combat ranked (I'm expert, for what that's worth). This weapon loadout is excellent at taking out any small to medium ship (up to and including clippers/ASPs), and quite decent at taking out large ships.