I'd say Purina Hall of Fame by Propagandhi. It's a punk track that starts fast then slows in the middle before hitting my favorite lyrics of all time followed by the most cathartic guitar solo I've ever heard. It rules. Post-rock and post-metal are also great subgenres for this. A Hail of Bombs by Red Sparowes, From Roots to Needles by If These Trees Could Talk, and Weight by ISIS all have incredible build ups and climaxes.