This is pretty much what I'm doing, here's my build at level 67 if you're interested.
Pro tip on build making: you won't ever have 111 points to spent as it stands, you should aim your build around 90 points instead of 111.
For my build, I used to use Conductivity but at some point in merciless it didn't make all that much of a difference with or without it so I dropped it for Critical Weakness (even more crit chance + crit damage).
For Auras I only ever use Discipline and Clarity, tough at some point I did wait to level Clarity since the mana reserved eats a pretty big portion of my mana pool.
Most of the time I play with Spark + Lesser Multiple Projectile + Fork + Item Rarity (because why not :D), I sometimes swap for Faster Projectile because it's awesome and makes Spark somewhat more accurate. I tried LMP + GMP and it's amazing but really mana intensive (~90 per cast at Spark lvl 16) :p. In the future I'll probably use a totem with another spark for some more free dps or a cold spell for the chill or something.
I went full damage until act 1 merciless, at that point I had trouble soloing The Ledge without dying, a lot of stuff was 1 shot killing me. Things got easier very quickly when I invested in some ES and life. Right now I have ~1200 life and ~1400 ES, geared only with ES+Evasion gear. As long as I kite and don't get hit too much I don't have too much trouble. I didn't start doing maps though, so I can't comment on those. From normal to the end of merciless I soloed pretty much everything, except for the bandits in act 2, General Gravicius and the final Piety in act 3. Right now I'm soloing The Docks pretty easily to level up and gear up some more before maps.
Some comments for the build you linked:
- You will miss somme dex for fork, faster projectiles and LMP/GMP
- You really don't need any casting speed at all, with LMP and fork you decimate pretty much anything with a few casts except some nasty yellows.
- You will cry tears of blood in merciless if you don't pick any health/energy shield nodes.
For yellow mobs, watch out for elemental reflection yellows. I killed myself pretty often on those while leveling. The only other troublesome ones are the very fast ones (hard to kite), and the ones that have insane energy shield just takes a while to kill.