Here's what I would like to see:

Railguns - Small and large, I like them pretty much how they are.

Blasters - I'd like to see these function more as vehicle-mounted shotguns. Short ranged, high damage, like they are in EVE

Autocannons - These should take the role basters currently occupy.

Artillery - Take on the role of indirect fire, as their name would indicate. Mortar type stuff for the smalls, full-on cannon artillery for the larges. Ideally there should be a weapon or piece of equipment allowing a forward scout to mark a location so that it is easier for an artillery user to hit that point.

Beam Lasers - Should work similarly to the current laser rifle, putting out a beam that can damage anyone that steps through it.

Pulse Lasers - Should have a charge-up mechanic not unlike the railgun, putting out a wide laser burst.

Rockets - Same as missiles currently work, single missile for smalls, multiple small missiles for a large.

Missiles - Small missiles would serve as user guided missiles, where after you shoot the direction you turn your turret indicates the direction the missile turns. Turn radius needn't be great, just enough to help hit your target. Large missiles should function like cruise missiles, upon firing them your camera changes to that of the missile and you pilot it to the target.

I want logistics modules to move to small turrets.