pretty much any GSP fight is a perfect example of how to gameplan. Pick what makes your opponent uncomfortable and then do it!
On the flip side my favourite gameplan ever is Belcher Vs Palhares... Go to your opponents strength... beat him at him then beat him up! Badass!
there was one in particular, I don't remember who the opponent was, but the gameplan was to fight the first 2 rounds in the clinch to influence the opponent's bloodflow so he couldn't perform as well anymore. that was sick