Btw current patch Arkaine's is an interesting option too, definitely for current-patch players. I'd even argue while 1.07 Ark is probably always better, for ES Sorc the difference is really smaller than usual. Just because life/vit is not quite as crucial for her, and the iDR from 1.10+ Ark on the other hand is actually helpful for ES Sorc. It's in fact my go-to body armor choice for my Nova/ES Sorcs when running Cows or Pit on higher player settings.
But integer dmg reduction really shines with 95% ES build, not so much with lower ES levels. Same for largely ignoring resists etc... Obviously haven't tried much in PvP but I might move some points out of mastery/synergies and try 95 ES (or close) with more integer dmg reduction stuff. Would lose a good chunk of FB damage but could be worth it.
But integer dmg reduction really shines with 95% ES build, not so much with lower ES levels. Same for largely ignoring resists etc... Obviously haven't tried much in PvP but I might move some points out of mastery/synergies and try 95 ES (or close) with more integer dmg reduction stuff. Would lose a good chunk of FB damage but could be worth it.