Critical: there is this hat in Khryslalis, not sure the name, pretty sure you can craft them from a vendor in Saradynx (I can't spell the names of areas sorry). Malistaire robe. The boots from Rasputin and that dungeon before Rasputin (the dungeon also drops the mini mammoth mount from one of the bosses).
Athame for being offensive is the one that drops from the first boss in the graveyard and the ring would be alpha omega ring. There is a critical ring that drops from Baba Yaga but it has little mana given so your mana will go down A LOT.
I don't have a name for this one other than solo/or just average: Full Malistaire gear.
Defensive: Jade gear and if you are healing I've seen players use Stone of the Other Side (I think that's what it's called?)