Enchanters are always fun. Slightly challenging, great for soloing or grouping. Is there anything specific you want to know? I like Coercers myself; especially in RoK. Tons of good pets to charm.

Nice to be wanted for grouping and raids, while still being able to solo very well.
I've never played a Necromancer past level ten or so, so I cannot truly comment much on the class.
In theory a Coercer or Illusionist and a Wizard should be able to power through most anything you'll end up fighting pretty quickly. Anyone that duos have an opinion? I've mostly soloed on my Coercer so far.