Trying to find a lighter bat

I'm upgrading my blade and rubbers from an all-round set-up to an offensive bat (as advised by members of my t t club). I've picked my fast rubbers, but want to find a lighter bat than has been recommended to me, probably a balsa bat weighing 75-80g. However, I'm bamboozled by the huge choice available! I'm not sure what criteria to use when making my selection. Although largely an attacking player, I do still have a foot in the defensive camp.