IMO mclarke's build is a little overkill on mana.
With a good group you shoudl not need a lot of mana at low level. If you are going to go with that build I would suggest using maybe only 1 weapon.
Instead I would look into glyphs. When using glyphs you are able to use all intelligence gear and still have max mana from glyphs.
As well I would either use some max hp on gear or get a max hp glyph for low level as it is very easy to die at low level if you are not careful.
Point wise I would suggest adding some vita, I usually add 10 just to be save(Many will disagree but IMO prof is too hard to come by now a days, that little vita may help save you from dying)
For stats go all into intelligence, and a few into vita if you wish.
Abilities I dont see much of a correct way here. If you want to get a really high crit use the powercast, if not use the other two.
I always seem to use two of them and find it works fairly well.
As for gear:
Weapon: Most intel you can get
Armor: Most intel you can get
Charm: Highest ee you can get, as well make sure that you upgrade levels. A lvl 5 charm with 40ee is the same as a level 0 charm with 60ee. The same goes for a lvl 10 with 20 ee would be the same as a lvl 0 charm with 60 ee.
Always carry a heal with you as well. As I said with charm the same goes for heal charms, get the highest you can.
With this build you will need glyphs for low levels.
If you are not using glyphs I would suggest swapping out either your weapon or armor with a max mana item. The charm and heal charm will stay the same.
Hope this helps!
