If you were considering occultist I recommend Vortex/Coldsnap. I ripped on SSFBetrayal arc miner and remade a witch as she is my personal favorite flavor. Went vortex for the sole reason that I like the MTX for it, haha.
in 20 hours played, totally solo self found, I was WALKING through the atlas and nothing even remotely slowed the character down. On a 4 link I would go through a kitava act 10 phase, uber lab izaro or normal Atziri in a few casts. SHIT gear as CI dual curse occultist, like a 550 ES chest 5link. Swapped to CI in high 70s once I knew I could hit 7500+ ES, which is the lowest I've ever done on a HC character.
My highest maps were only tier 10 or normal Atziri on SSF, so I ripped the character to standard to see just how far it could go without gear upgrades. Went directly into a tier 16 map, alched and chaosed to the rippiest mods I could think of; less regen, neg res, vuln, ele weakness etc. Vortex melted all the packs and rares, was poor/average on mino and hydra. Faster regen nodes + ring craft made phoenix and chimera trivial.
With 200 more flat ES on gear I would have been happier, so I could have hit 8500 to prevent near-one shots, but up to t16 deathless with lvl 18 vortex, no quality on any gems.
here is an endgame version of the build, look at wagglePEPESILVIA
View Profile - Path of Exile - Dsfarblarwaggle