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800+ damage AoE with knock up and 75% slow
750+ damage AoE silence with 15% slow
100+ damage auto-attack with 250+ damage AoE Vorpal Spikes with 15% slow
900+ true damage ult with 30% slow
This is all you need to know.
Build Survivability instead of Void Staff if you find yourself dying. If you ever reach that point you shouldn't be dying at all though. Banshee's, Guardian Angel, and Frozen Heart are the best choices for survivability on Cho at that point.
I honestly do not recommend building any survivability at all. If you manage to make it as far as Zhonya's you are an unstoppable killing/slowing/silencing machine. The only reason you'd ever need survivability is if you were not playing your role correctly. You are a beefy mage. You are not a tank. You should be at the front lines poking with ruptures and creating the opportunity for your team to rush in and score an ace. You should not be rushing into the 5 enemy players and trying to soak up damage to keep your team alive. with 4,000+ HP you are perfect for being at the front lines and taking a bit of damage before a true engagement, but you have no armor or magic resist. Your health with go down in an instant if you get 3 or 4 guys jumping on you and using their abilities.