Recommendation Needed: Ogre Shaman or Iksar Necro!

[Faywind]

I've been around P99 for a bit now but I seem to be a bit of an "alt-oholic".

I'm trying to find a class to play that I will continue to play past level 20.

Current Classes I've played and haven't really liked too much:
Enchanter, Druid, Mage, Paladin, Ranger

I currently play very casually. Usually a couple nights a week (2 hour sessions) and on weekends. So typically I don't have time much for groups so I will mainly play solo.

Which do you think would work better for me? Shaman or Necro? I can't seem to decide between the 2.

Thanks in advance!

(I have a few thousand plat to spend as well on minor twinkage)