I'm just about level 44 and want to star planning for 50. For a all int mage is the cosmos set with wand and eye the best that it gets?

Which bosses drop any of the 4 items?

Purchasing the items looks to be around:
Helm 40k
Wand 140k
Robe 400k (yikes!)
Eye 100k

I already have bought up a set of "of the Fate" that was pretty good looking and super duper cheap.