waht type of captain is flying your boat ? tac/sci/eng?
also depends on your playstyle, and preference of movement as well while in combat.
personally I make my cruiser as tough as nails as possible with an eng capt...then fire at will beam arrays as much as possible to draw mobs in towards me while dropping mines as I make wide lazy cirling arcs while pooting out ejected warp plasma to slow them dowm as the mines blast them apart when they cant escape away from the glowing goo.
but thats a typical pve tanky style loadout.... results may vary .....
---- FIRE EVERYTHING ! ----
But cruisers should mostly stick to beam arrays to offset the low turn rate to enable broadside attacks.
For example: I've got a Tac flying an Assault Cruiser Refit, and I'm packing 6 beam arrays and 2 torpedo launchers. But then again I prefer the more balanced loadout, break through shields then hammer with a torp spread. She may not be the most powerful thing in the galaxy, especially with escorts owning everything in sight, but she gets the job done. Works well in PvE, and managed to hold off a PvP D'Kora while working with another ship before I upgraded to the Refit. Like the guy above me said results may vary.
Wouldn't worry too much since you won't be using it for long (though your next ship is important since its your last free one). Beam arrays, a torpedo or two, maybe even a dual-beam, should get the job done.