Weapon for the DoT Mage

Hi, what weapon would you suggest for this build type? (lightning Disintegrate, fire Glyph of Dominion and Trinity of Elements being main skills, with some triggered Elemental novas as a bonus)

I guess two handed staff is the way to go, because the base damage is too valuable and I haven’t found anything on off hand to compensate. On the other hand, staves have no useful suffixes for Dot builds whatsoever (why??)

so, how do you guys do this kind of stuff?

There’s ignite chance & the various elemental penetrations.

Giving the build planner would help.