You're way over the 40% CDR cap. That's kinda dumb.
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Item Sequence






Spirit Visage
2700

Iceborn Gauntlet
2900

Zephyr
3100

Randuin's Omen
2700

Runic Bulwark
2950
I would try out that

Earlygame:







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So let's cut to the chase. I've been experimenting with builds and I believe I'm onto a build that can be devastating to the enemy team regardless of what may be thrown at you. I have looked over all the items and so far what I have been having the most fun with is the following:
http://www.mobafire.com/league-of-legends/item-purchase-planner#&item=81-150-135-113-56-65
I stack armor CDR and Health with some MR as well as additional Passives and Actives that SO FAR from what I've seen will garuntee the scariest Nasus on the field. As long as you farm Q properly of course.
I want other people to test it out and leave feedback with match history screenies. This way I can see if (with other playstyles) this build stays true with what I want it to dish and take.
My masteries are 0/21/9 [O/D/U] and My runes are nonexistant so use whatever. I'm more concerned about the items right now.