The only stats that really matter are:

-Hit%
-Crit
-Dodge
-Damage/DPS
-Armor

You won't really notice a small health/mana pool bonus, nor some Str/Dex/Int points.

And unfortunately, the Comm's Heavy Weapons aren't very efficient any more. With a single/target weapon with much more damage, the boost to your AOE skills will far exceed any AOE damage you'll do with a cannon. I only use it for looks in town