The wisps are level 10ish, I think they'll be green by 17, but you can always kill them while you're killing other stuff in the area for the plat. NK is the better place to kill wisps so that you can quickly hand in the stones to Mrysila at the gypsy camp for plat and exp after you fill your inventory. For the level 12 enchanter, I'd kill the wisps around the wizard spires since not much in the way of KOS mobs wanders around there.
On my enchanter I was able to do the Stein of Moggok quest too at level 12, which will take about 8 hours, but it's fun to do and you get a 10 int item that will take a while to upgrade.
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