Please note that with the items discussed you are free to choose these in different orders dependent on you're needs. If you're up against Garen or another physical damage dealer rush Frozen Heart before Force of nature. Likewise, if you're against magic users like Ryze and Annie, push Wit's End before Atma's impaler.

Also note that Atma's impaler works best at full feast stacks so if you're using this as your major damage item, feast quickly before entering combat.

For more information check out the Cho'Gath Champion spotlight, presented by Phreak, on youtube by RiotGamesInc http://www.youtube.com/watch?v=GJ8QI_7puvU