Ogre Shadow Agi and Fungi Tunic

[howdyhofriends]

Hello, I'm wanting to roll an Ogre Shadow Knight and I'm planning on eventually using a Fungus Covered Scale Tunic.

I have 2 questions..

1) I planned on pumping 15 stats points into Agi to get it to 85, with the other 5 into Int. Will having only 75 Int be an issue? Will I have enough mana to solo and also for groups? I don't want to rely on gear to keep me over the 75 Agi with Fungi equipped.

2) How useful is a Fungi Tunic at higher levels, including 60? Can it still be good to wear instead of other chest pieces? I only plan on doing small group content and solo, so I will never see the really high end no drop gear.

Thanks for any incite you can give me!