Mouse and Keyboard for shooting, definitely. But competitive play is only part of the game's appeal. A HOTAS, if you can afford one, is a superb addition to the base game. I can hear Yamiks bellowing 'My immmmeeerrrshun', but it really does draw you into the fantasy that you're flying a make believe spaceship. It makes pulling off fancy manoeuvres feel like an achievement, it's much more intuitive than a gamepad and it's brilliant fun, amongst many other things.
CptArcher, are you interested in playing competitively? If you're not part of a PvP group, it might be worth reaching out to one?