IMG gunboat is a good choice, it's a good ship if you know how to fly it, except I'm not quite sure if it's really 'freelancer' might be restricted to IMG and their allies.
Liberty/Bretonian gunboat, depends on where you work more, if you're more active in NY, get the liberty, and if you're more active in Bretonia, the Bretonian gunboat.
If you get the liberty, theres no need to leave a turret empty, use it to it's full potential.
