Looking for build help (duo'ing with an invoker)

Pretty much the title. I'm trying to plan ahead (have a few choices in mind just in case builds get nuked or what not) for 0.4. If something looks intriguing with a druid ascendancy I'll pair that with my buddy who is going Invoker. Otherwise, I'm trying to see if there are any particular builds that would pair well with a monk. I do prefer ranged over melee in general, and nothing involving minions. I despise minion builds.

I do have a few ideas so far, but I'm not sure how they pair with monk and/or scale as you get into maps, T15s, etc.

- ED/Contagion Lich
- Poison Pathfinder
- Frost Stormweaver (is there any way to improve visual clarity, frostbolts fill the screen once you get really going it seems like)
- Tactician (never played one, but I've been told they have some support skills that can benefit a party)


If anyone else has any ideas, I'm all ears. He will end up going flicker in higher tier maps, so I know I'll need some good boots to even remotely keep up.