You've covered most spells. But don't forget "Protection", 3 Alteration, 1 Nature. It's castable even by your Bards and Sidhe Champion, making them more useful in battle.
And as another has said, Nature 6 is not very useful for the blessed effect. So, either go all the way to Nature 9 or just stop at Nature 4 or 5. Unfortunately, The Tuatha Man does need some help on Nature (how ironical
. So, I guess having a Nature 4 Pretender is not necessarily a bad idea. I don't think too many people has looked at it, but the White Bull seems to be a good pretender. After getting personal regeneration, (Enchantment 3), he's quite powerful.
But if you want to go for diversity, adding some Fire with Moloch or Death with Prince of Death is not bad.
If you're going for Conjuration, don't forget the Firebolg (Conj 5) and Lamia Queen (Conj 6). They're both good bargains.
Also, if you go for Chaotic scale, I don't think you'd have gold to hire a lot of Tuatha (and Sidhe). Take that into account.
That's all I can think of for now.