The best "ungeared" or Untwinked class by far is the Necro. You can do virtually everything a geared necro can (just a more med time is all so a lil slower). And xp faster and do more then most classes fully geared. IMO the most powerful class in the game. Again IMO all.
Iksar is a preferred race by many for the hp regen. I went that route on 99 and if you know the zones and where to go the "mythical" xp penalty that so many WHINE about isn't even a factor. My necro is now lvl 37 and about a month and a half old. And I spent a lot of time working on research with no XP happening. 145 skill now $$$
In live I played a DE Necro as I started at game start. Played all the way into end game content in each expac up through Omens. So a DE can do it just as well as a Iksar. Just got to watch your hp's more is all.
If you go the necro route and have any questions shoot me a tell. Would be more then happy to help ya.
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Oh and there is a nice post where some of us wrote up leveling guides for necro's. Post is named "Iksar Necro Guide".
Rotted Corpse
Necromancer of Cabilis