I have had my best long range weapon on my bridge (currently plasma torpedos) since I built my base so that it can help a bit with my whole base defense.  But I have seen a fair number of bases that use lasers on the bridge as a point defense against blitzing - and when a (stupid) fleet gets in range, it is dies fairly fast.  It is a balancing act - to stop both blitz and range attacks, and it sounds like you need the most help with range, and so go (like me) with something that will engage at the longest range you can.

I have a maxed out laser on my Bridge. I've seen a Bridge with a plasma torp on it and the ships just sat on top of the Bridge taking it out. I do have 4 plasma torps as well which help with the long range attacks. 

Always accompany your Chargers with something long range (preferably Torps) in order to keep away the sniping Destroyers + Mass Drivers.

I put plasma charger on the Bridge,your bridge must can handdle any kind of threat,so its better with the plasma charge/torpedo