Dengeki Sentai Changeman, Hikari Sentai Maskman and Choujin Sentai Jetman (all three sung by the aforementioned Hironobu Kageyama). Same goes for the Ending songs to those series, also by Hironobu Kageyama. While Maskman is one to get the blood pumping with lots of sharp brass stings, Changeman is a weirdly groovy opening that you could conceivably swing dance to.
Gaoranger! Hoero, Gaoranger's opening, gives off a downright dangerous vibe in amidst all the hot blood. Same goes for the music accompanying the transformation and roll call: "Seigi no Otakebi Ari!", which sends the signal that an immense asskicking is coming the villains' way.
Tokusou Sentai Dekaranger (sung by Psychic Lover, who later went on to do the Shinkenger theme). And its awesome ending, which uses jazz! Seriously, you'll be surprised how jazz works with the whole idea of Dekaranger. The singer of that ending theme? The aforementioned Isao Sasaki himself.
GoGo Sentai Boukenger's ED, On The Road (also by Psychic Lover). A soaring and hopeful song that'll get you excited for the next episode.
Go-Onger has several mixes of its ending theme, which are cool enough in themselves - but the real winner comes in the Shinkenger vs. Go-onger movie, with "Samurai First Rap ~Ginmaku-BANG!!~", which gives the focus to Shinkenger and blends in parts of their themes.
Its opening is even better. The show gets you hyped for more from beginning to end.
The OP for Ressha Sentai ToQger manages to capture the fun and excitement of trains and imagination in its infectiously catchy and fun melodies.
Shuriken Sentai Ninninger gives us Saa, Ike Ninninger! It is, for all intents and purposes, a mix of old and new Sentai openings that also manages to capture the ninja theme of the season.
"LUCKY STAR", the OP for Uchu Sentai Kyuranger, manages to be one of the most upbeat and heroic openers of the entire franchise through its almost overwhelmingly positive melody and its fast tempo. It keeps you glued to your seat, desperately wanting more. It also has instrumental variants: the gentle-sounding "In the Sky I Looked Towards" and the majestic-sounding "Galactic-Level Victory".
Kyūkyū Sentai GoGoV's opening is one of the most heroic-sounding themes in all of Sentai's history, playing up the urgency of the disasters the team often face. It makes sense when you consider that not only are Emergency Services often heroes of their own in real life, but doubly so in Japan: a nation on three tectonic plates where natural disasters like earthquakes, tsunamis and typhoons are commonplace.
Both Ryusoulger and Kiramager have optimistic openings and equally upbeat and very catchy ending themes. The teamup film between the two mixes the ending themes for "Kiraful Party De Kira Que Boom", which is an absolute bop.