If your decisions between monk and necro I would say go necro; they are more in demand and have a lot of good capabilities solo and in groups; their ability to out survive most anyone is pretty awesome in bad situations with fd.
Although I would recommend druid if you're looking at good areas and solo ability. Druids can solo a million different ways, get groups because they're healers/2nd rate dps and snares, make money from ports, etc. The only downsides to druid are:
potentially overplayed (I would say this is also true about monks, but everyone likes a good monk)
no fd
If not druid necro would be my next choice
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