Here is my tal wiz for anyone curious
http://us.battle.net/d3/en/profile/eek-1673/hero/71161335
I usually use in-geom in cube but I was doing ubers to gear up my zdps wd. Gems are BotP, Eso, trapped for GRs.
I find it more fun than DMO for GRs. Once you get enough DBs you can just swap out Eso for lightning one for rifts and speed farm keys or tal source and wear gold wrap and then swap eso for boon so no skill/gear swap really to switch between GR/NR.
For bounties I like to use cosmic strand (crafted; wormhole on teleport). I tried 4s oculus but it's applied before CDR so it's not as fast.
Cosmic strand not super fast without in-geom proc but with 50+% cdr it's passable and you kill stuff fast enough that it's still pretty quick for bounty.
I've seen some GR builds that replace in-geom with furnace. I tried it and it's.. decent but I don't think it's worth it. You should push GRs as high as you can maintain in-geom proc. You really only need to get 3-4 seconds worth per elite to make it worth it.