Best item from VP?

[Vexenu]

Assume you have a VP key ready to go, but you aren't sure which of your characters to give it to. You're choosing between a Wizard, a Cleric and a Necro. Each has a very nice class specific item from VP they would benefit from:

Cleric: https://wiki.project1999.com/Shissar_Apothic_Staff

Wizard: https://wiki.project1999.com/Solist%..._of_Invocation

Necro: https://wiki.project1999.com/Shissar_Seance_Staff

Which class do you think would benefit the most from its respective item? Especially interested in hearing from people who actually have one or more of these. How much use do you get out of it? Did it totally change the way you play?

I'm leaning Wizard at the moment just because being able to sustain ~50 DPS mana-free seems completely game changing. But healing 2500hp per minute mana free on the Cleric or having a ~700 hp mana free lifetap on the Necro are also pretty damn huge. Seems a tough call. Thoughts?