yeah, ES got knocked down alot. Budget builds are looking at 6.5-8k ES tops Alot less of a HP gap over life builds then before. with the loss of life flasks, easier leech, and armor/evade.
3.1 added a great deal of life regen. ES regen might be the right way to go now, over leech.
I'd probably be going occultist for any ES build, for its extra ES, and regen.
Elementalist is a bit underrated I think. Its like deadeye. people have this weird all or nothing, in this game. The golem buffs are awesome. The penetration is awesome. Elemental DR/reflect is awesome.