I think that Mana Efficiency and Mana Leech are two of the best skills a character may learn...infact many spells/abilities require too much Mana even at level 1 (for example Thousand Strikes requires 236 Mp at Level 1 *-*)
Battle Rage is usefull only when you're fighting a single enemy...if used against many enemies it could bring to a quick death due to the Armor penalty...use it carefully
