Necro (aggro or fear kite) and Bard (AE kite) are both easily able to solo pretty much naked.
Monk needs a lot more gear, but hey... They are badass, and a lot of fun to play!
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Getting groups is (in my experience) by far easiest as a monk. Bards have a very big xp penalty, and most groups will simply rather pick another dps over a necro.
You could also consider an enchanter. Not extremely geardependant, loved in groups and stupidly strong solo (charm)...