I have a M'avina MA/Strafe Frost Maiden, she uses CtA on switch (demon limb before I made that). CtA gives a big boost to clear speed by increasing skills and mana pool as well as increasing the whole squad's survivability.
I found this thread about Ice Maiden theorycrafting incredibly illuminating, and though I haven't followed its advice precisely I gained a lot of knowledge that I used to make my choices about this build. Specific points of interest include arguments for Pdam over raw magic DPS.
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I read another thread somewhere that made a really compelling argument for Strafe as 1 point wonder (main point being you can hit max number of arrows with multiple targets at 1 point +skills, and no strafe lock).
She uses L8 Strafe and L10 MA for CIs, mostly MA. I don't find they slow her down at all but it depends what you're running I suppose. She runs P7 AT extensively, she's not as fast a blizz sorc obviously but she's close.
I use Cat's Eye, I'd use HLW if I had one. I prefer to get my IAS here rather than the weapon for reasons described below.
I use a Pskull in my bow, which I think is a first for me in LoD at least. I ran Nef for a while, big meh. The PSkull upped my clear speed substantially. Unless I found a really killer dual leech ring I doubt I'd even replace it with a facet. I have been strongly considering a Vex here.
I run Raven Frost and a LL/Resist/minDam/MF ring. I ran a dual leech ring for a bit but found the +mindam and other stats on this ring superior overall. Along with perfect WT and a few charms, this also gets my MF near 200.
I suppose if a 1.07 Mpk ring got you there, you could then run Mara's and Shael for more DPS. I don't have such things so I couldn't comment as to how this stacks up, but I can say that I have very few mana issues with this character as she is currently built.
Cold Facets in Helm and Chest. No brainer here.
I have 110 base vit +10 from war travs. I run max decoy and level 17(+) valk. I recast decoy often and often use it to pull, also cast Slow Missiles often. Between these factors she is very safe and only dies when I get lazy. Leveling was dicey (see: slow, but only dangerous if I got lazy) in some areas but she benefits from a patient, pull-based playstyle.
90 Str (132 with gear), minimum to avoid annoying Str bug issues.
Rest goes to Dex, currently sitting at 417. Extra skills go into MA at this point.
I put 1 point into Penetrate (AR skill), she hits 95% with FA and 90% with MA.
14 points (80%) pierce. I have never noticed FA to *not* damage all targets in its AoE on a pierce, though my AR is quite high so it's hard to say honestly. Stuff is usually puddles before I have a chance to notice such things.
She ran max Strafe and 1pt valk/MA for a while, I find her current setup safer and more effective. I found MA just as effective as strafe for bosses, single targets, and convenient rows of CIs, if not better. I swap between them often, even with max strafe and 1pt MA I found I was preferring MA which is why I made the switch. Really underrated skill.
Merc uses Insight, GBane, VGaze. Infinity is probably good but again this is a question of sustained DPS. I don't have infinity but I feel like in my case it wouldn't be a huge upgrade. Mpk ring could make this a different story.
General observations from playing this build:
Don't skimp on your physical DPS, even with insight you'll never keep up with the mana consumption of FA. War Travs, +pdam on rings, might merc, DEX, pdam charms if you have good ones, whatever you can do to get that leech up. The more you leech the more you cast FA the more stuff continues to get deader.
+Cold Damage on charms scales incredibly well, especially as you start adding facets. It gets counted on your physical shots as well as FA, each source adds a second of freeze time to FA(!!!), and it takes your +cold dmg% on physical shots. I was using some Sharp GCs (no 1.07 tho) for a while and eventually replaced everything with +CD.
I ran council with her for a bit with this same setup, her team was very safe and cleared the council fairly quickly when I used the decoy smartly but maps with lots of ghoul lord spawns went slowly due to CI/phys resist and I often ditched these. Ultimately the going was slower than I liked (but much more effective than I expected) and she went back to AT.
This is my favorite AT runner, and my favorite character to play overall. I find the playstyle really engaging, she has incredibly potent offense combined with dynamic defense and has the perfect answer to any situation that AT at the very least can throw at her.