Enchanter's usefulness (other then buffing) is pretty dependent on how they do resists and whether crim pots are going to be in. If at 150 resists your untouchable by spells then there is going to be a problem.
Shadowknight is pretty much what you mentioned considering the xp penalty.
I think shaman is your best choice for end game considerations in terms of pvp. Ebolt does a shit ton of damage on casters. It can be cured but it ticks fast and if your not dueling, in the craziness of a pvp battle it will typically go uncured. You also get a relatively decent haste buff for mage and necro pets and melee.
Another consideration maybe a bard. They get a lot of enchanter like abilities but can do them while moving.
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