Once we get some more entails on the specializations, I think I can make a clearer choice.
As for now, I can say if the necromancer speciality enhances any entropy powers, I'd be more inclined to it. I get the feeling raising dead and ripping souls out foes for healing/enhancements is part of the power set.
I'd like to know what a rift mage is. Is it like a spirit healer, where the mage can call upon spirits within the fade for more power/buffs/enhancements?
Knight enchanter does sound like fun. If I can get some "swording" on, and spell casting, I don't mind.