I lost all my DII characters recently, so I'm starting again, with my favourite character, currently lvl 18.
I doubt now between Charged Strike as a main-melee attack & Jab.
CS has AoE and is a good boss killer and gives synergy to my bread & butter Lightning Fury. (The lvl 30 throwing skill, I tend to mix up the names.) However, especially with bad gear, mana is an issue to the extent that the skill isn't very useful as "main".
Jab is much more mana efficient & a tremendous help to regain energy. Damage is lower, though, and no AoE
About gear: I only have Manald Heal, Nagelring, Chance Guards & Stealth. (Got them from a friend.) I only play singleplayer (players8) and have no intrest whatsoever in going online. (Except to trade, obviously.)