What's the best general-purpose PLing class?

[Estu]

Bards are best for AE classes, but what about everyone else? From what I've read it's between monk and necro: they both use basically the same method (get the mob almost dead, then feign), but monks have the advantage of not using mana while necros have the advantage of not relying on the PLee to finish the mob (their DoT can finish the mob while they're feigned; the PLee just needs to get one point of damage in).

For what levels is powerleveling effective? Can you powerlevel pretty decently right up until Chardok AE proxy time?