Cannons were my first and still my favorite. I never got the Fire at Will hype, even before the nerf. Rapid Fire ftw.
Auras ftw! The non-weapons Iconian set has some nice visuals, too. That's the only thing I have with visuals. There's a deflector aura + arcanish paintjob.
The weapons set that's the reward for Beyond the Nexus looks decent. It has an Omni... and a turret... and a nice console. I think there is weapons haste....? as one of the set powers..? I don't know the set powers. It wouldn't fit your Klingon too well, though, probably... due to the weapons are phasers.
Xev has purple cannons, among others, but I don't know if they're Temporal, Iconian, or if he has something else not in those sets that is purple. They're AP, I know that! The torps in the Iconian and Temporal sets are decent, too. The Crystalline universal console from the Phoenix Packs is an easy console choice for AP.
I have 1 AP build. and 1 Polaron. Somehow I ended up with 3 plasma builds even though Plasma is only fun to me for the torps and I am more into cannons. Two of the plasma builds are pretty different from each other - the third I am in the process of replacing with something else... I'm leaning towards phasers at this point due to the Beyond the Nexus rewards, and, I think I have a mish saved with a really nice phaser weapons set to go with the BtN set. I don't like those slow torps in BtN, tho.