As Zeewolf (what a great game that was!

) points out - opinions will vary. Personally I don't like limited ammo. I go for lazors therefore. I've tried:
Class 3 gimballed pulse and Class 1 gimballed pulse together - nice damage, when your guns aren't cooling down.
Class 4 fixed beam and class 2 fixed beam together - nice damage, when you hit and when your guns aren't cooling down.
Class 1 gimballed beam and class 1 gimballed pulse - nice damage and not too long to wait between firing bursts.
Obviously I have no great desire to manage weapons terribly effectively, I simply want to point, pull trigger and kill things. I like the pew pew without thinking too much. Lazy? yes. Most effective and efficent? Definitely not.
I will probably go for four class 1 gimballed pulse (can't seem to find class 2 gimballed pulse) lazors, sit back and shoot. I don't much like the idea of class 4 hardpoints having class 1 gimballed weapons in them, but until there's some way other than 4 pips to increase cool downs I find class 3 gimballed pulse lasers simply too power hungry to be satisfying.
I'd rather nibble piranha style at a Cobra's rear-end until it explodes than slam it into the two-shot rail-gun wall - simply because I'd miss with rail guns or mis-time the shots and end up more frustrated than satisfied.
This is just my way of playing, natch.