Wouldn't 20 Agility be a better enchantment anyway? It grants a steady ~0.88% dodge with Kings, and Mongoose grants around ~5.28% dodge over what (assuming 1.4% PPM and 15 second duration) appears to be around 35% of the time.
0.35 x 5.28 = 1.848% average dodge
0.35 x 264 = 92.4 average armor
Alright, maybe Mongoose would be better, but I don't know. I'd probably just go with spell damage anyway, and consider a different option if I truly wanted to sacrifice some threat for avoidance.
EDIT: Another thought, from a purely itemlevel standpoint, it would take just barely under 46.2 agility in order to get the average amount of dodge and armor offered by Mongoose. Since one point of agility is worth 1 ilevel of stats and one point of spell damage is worth 0.855:
Mongoose is (on average) worth 46.2 ilevel of stats (with Kings), while Major Spellpower is worth only 34.2, and 20 Agility is 22 (Kings included).
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Stormreaver US
