I have a combination of cyclotron ballista and rocket launcher on my fighter. It’s fun, but the rocket launcher doesn’t always kill enemies in one shot when the shields are down. Bummer :-) What do you use for that overwhelming sense of power in space?
Another vote for the Infra-knife. Don’t group upgrades, put your max-stat X-class mods in the 4 supercharged slots of your fully expanded ship, wherever they appear on the grid, and you can get 55,000+ damage on an Exotic or Solar, 65k+ on a Fighter.