What's Up People!? by Maximum The Hormone, I know it sounds kinda trashy, but when they just randomly scream in the beginning I get shivers of awesome-ness.
For me, it's Dive to World by Cherryblossom, which I absolutely cannot skip, with Sakura Addicition (Hibari Kyoya vs Mukuro Rokudo) by Hibari's and Mukuro's seiyuu's (forgot there names ><) very close to that, lol.