I feel this build has several inherent problems.

With the runes, building ALL AP means you are sacrificing on several other advantages you could have, as well as efficiency. Magic Pen Marks are a must, though AS runes would work very well also; Clarity seals are important on cho, though I can see dodge or armor seals working well as well; CDR glyphs are amazing with chogath... If you get flat CDR glyphs, this build would give Chogath a whopping 33% CDR.

Defensive Masteries would greatly benefit this type of cho. When I go AS chogath, I usually go 9-21-0, so the defense offsets the builds inherent squishy-ness.

With summoner skills, there are several choices involved here, however I feel Exhaust is a must. With AS cho, you'll be going head to head with other natural auto-attackers, and this really gives you an edge. Also, if you begin an assault with exhaust, it makes Rupture ridiculously easy to hit with.

Finally, I'd like to suggest replacing Rod of Ages with a defensive item for the final item. Rylai's fulfills the same needs as RoA does at that point, and I've had greater success with it because it gives more hp. For a defensive item, Guardian Angel is amazing, but there are other strong choices such as Banshee's Veil as well.

Trolololo you skill 3 summoner skills.
Ignite, Ghost and Teleport! XD

Why do you have a point in the teleport buff mastery when you don't have teleport?

I'm going to try this build right away. I'm also wondering on what server are you playing? EU, perhaps? Slap my *** and get the **** out. <3

Great build. Got a quadra kill first game with it. First quadra kill in a long time :).

Great build, but at the end you can sell your boots and pick up a phantom dancer in it's place.

Find some way of adding more movement into this, and you will hit them more often when they run :3 thanks to the crystal sceptre, all in all, an awesome build since all of your spells do damage and you can farm early on with the spikes, but the idea of getting spikes first isn't so great since they don't do much early on, and you need the knock-up from the rupture, but hey what do I care, cause it works once you start to get rockin' :P

this types of Cho are awsome!
In twisted treeline I ownd a ranked with Wit's End, malady, guardian angel and a rylai's.
Pure ownage!

Works wonders on Twisted Treeline!

This is strange, this build has a much higher rating than other builds in the top rated section of the site but isn't there

Yeah I could have done, it's an expensive build though, you're unlikely to get all the way to the end, i rarely do. Thankfully every vase item is really helpful so you can be good from the start, you don't need the whole build to rape. thanks though, i've added the elixers