I have a 60%ed Es1 and am still missing Blizz's HTP.
Going quite well so far. I might not bother investing in an ES5/6 until dupes come back. With 19% total damage and 6% magic, Blizz's ES7 ends up being better than most cheap alternatives, so I'll be a F/P with an ice staff!
lvl 13 Para
after getting an e5