[Edit: oops, missed that you don't have Half-Elf. This build might work well for Half-Orc or Human, without the martial weapons abilities. Haven't considered splashing into a druid yet, but a level of fighter might work too if you want to do a little melee with some real weapons
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I've been leveling up a Half-Elf, Max WIS with Fighter Dilettante caster druid, and so far he solos quite well. Starting stats (32pt) were:
STR - 14
DEX - 10
CON - 14
INT - 10
WIS - 18
CHA - 8
Feats: Haven't completely planned it out, but Toughness, Empower (swap to Maximize at higher levels), Spell Pen, SF: Evo, Heighten, Augment Summoning, then not sure what else. Basically going with the standard offensive caster feats for now.
Skill points - Max Concentration, rest in Balance.
Enhancements - plan to emphasize fire/cold spell boost early on, then have to see how it goes at higher levels. And of course, all toughness enhancements and CON/WIS ability boosts.