iksar looks better than all the other if you have the iksar luclin models on. Its the only luclin model i ever have turned on
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troll is a very close second w/ classic models. they look badass.
Also, iksar do get some nice perks and have decent stats for a shaman. the only problem is their low str/wis compared to a troll or ogre, but you can easily make that up by always fighting with your buffs on. I have no trouble soloing, and wont have any trouble group/solo all the way to 60