Str buffs are useful but not mandatory. I don't think +14 attack from Firefist does that much.
To be honest, I think the nuke spells are some of the most useful. The higher level spells get better damage per mana. Damage shields are super mana efficient so I'd get both the regular and then later the self buff.
Order of most important buys imo:
1. Light Heal
2. Shield of Thistles
3. Ignite
If you solo a lot then also get:
4. Thistlecoat
5. Tree Form
6. Firefist
You can wait until 14 to pick up invis vs animals.
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