Loken
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Why change one upgrade for another? What prevents you from buying the one you need right away?
And there's no need to immediately create two invisible units in your army; a few hunters are quite enough.
It's even better to attack the enemy with Fury units alongside a nearby Lizardman (yes, exactly them), because they move much more often. You can even take Sorgal, split the Furies into several stacks, and run around biting... it's quite effective.
Who would doubt that you like the Druid... since you're such an expert on Elves, tell me, is there much point in the new Druids? Chaos doesn't often occur for Elves, and even with a channel, the damage is small. And they shoot terribly. For example, I was very disappointed when I saw that 45 Druids kill a 0-1 Tan with one shot (or maybe it was a Bone Dragon, I don't remember, but someone not too thick and strong)...