A nice guide for Cho'gath. I have played him many times and is arguably my favorite champ. The only thing I would change is the skill sequence, from the looks of it this guide if for solo top, in which case I would max spikes secondly (if you were soloing top). Secondly I would go with Ghost and Ignite. Ignite works miracles early game (best around level 6) when you are in 1v1, for the extra damage helps lower the enemy champs health below 300, in which case ignite is an invite to dinner. (they never see it coming, their health dropping so low) If or when they start to run, you can rupture them, and finish them off >:D

*edit* crystalline flask is nice early game instead of doran's ring, as it restores a nice amount of mana and HP to last in lane. Along with doran's (when you have enough Mooneyz) it can be very helpful until you are no longer mana-hungry/full feast stacks.

Heal looses it's usefulness late game. You could get better use out of Exhaust if you want to help your team out. Other than that it's a good guide. Makes Cho the tank he is. Tho Cho can get good use out of abyssal scepter. You should add it in the guide, at least into the situational ones. Also it is better to finish ROA sooner to stack up it's stacks earlier or it looses it's potential power. Actually it would be best to finish it up as first major item, before frozen heart and warmog's. Tho that thing aside it is one good guide. +1