energy hiding/high energy set became a big step more effective esp for melees: you can pair a wand of the ele with a q5 estor foc to get a total of +50energy from a weapon swap and even more if you use a 15/-5 inherent on your main set weapon. can be effective if you face a lot of ene drain and some longer expencive casts.
another one ar 5str shields for casters (or anyone for that matter) for an extra 5 armor to before plus no attri spending needed for just the shield plus supplying immunity for the armor buff to weakness or wail of doom (since the 5attr buffs are not affected).
the necromancer, assassin, paragon and ranger mods can be used for energy management.
so far for some concepts - I don't have much time for testing, but I liked playing war with assassin mod and some of the crit increasing skills.