Beginner here, Motor KV advice?

I'm building my first drone out of the ZD550 frame. Most of the extra weight would be from a small gimbal like this (180g) and a gopro hero 4 (83g). What kv/size of motor would be ideal for this config, plus some extra? Some speed would also be nice ;D I'm hearing around 600-900 kv, but I have no idea if that range is too vague. Also, shouldn't I be more concerned about torque? I think that's estimated through physical motor size.