I'm checking out some priest on armory and i can see that some priest go dagger some mace.
Not really sure whats the best one tho.
I'm going with the staff because i in the first place think it looks awesome. But secondly i really like some extra spirit.
If you want spirits maces usually have that stat. It's sort of a throwback to when maces were "healer weapons" and daggers were "dps weapons". In general (especially now that OH can be enchanted) you will get more stats from a 1h + oh combination than a staff of equal ilvl.
If you search the past 2 weeks, someone actually did the full math on what you get with mh/oh vs staff.
It works out to roughly +35 intellect to use a 1-hander due to the extra enchant. You however lose a small chunk of spirit to crit for what can't be reforged.
All in all, 1h/oh is best, unless you desire the cosmetics of the staff.
Reading this, I ask myself: Why the hell did they have to introduce a offhand-enchant?
why couldnt they just leave it as it is, so that its possible to take Two-hand / One-hand+Offhand and both had same stats?
whats the point in making twohanders worse for every class/specc ?? (talking about int stuff obviously)
I wonder which idiot blizz-worker was drunk when he had that idea...