I have found the druid to be very friendly to an erratic playtime schedule. I am able to solo for EXP and gear effectively and I have found that groups are plentiful enough that I can get one if I need one.
I am level 38 now, and I think the druid fits the play schedule you describe quite well.
If you wont be playing a lot, and often, the Druid gives you opportunities to explore, quest, solo and group at any level I have seen so far.
Good Luck!
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Grelwin, Grelroc, Grelfu, Greltwin
60 Halfling Druid
57 Iksar Shadowknight
60 Iksar Monk
20 Halfling Druid
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