Apart from the original Pokemon theme song, which has been a staple anthem anime theme song, here some of my favorite Anime Opening songs. If you already know my taste in anime I hope this doesn’t seem redundant, since some of my favorite opening songs are from my favorite shows. Big surprise, right?
Songs that are ENGLISH versions will get a ( * ) by them, just so that its obvious that the song is on the list from nostalgia of childhood and not for any other reason.
1) Pokemon, The Johto Journeys, “Whole New World” ( * )
I know, I know, more Pokemon? But seriously, I love this opening as much as the original.
2) Ouran High School Host Club
Light hearted, sweet, this is just a great opening!
3) Bleach, Opening 3
Listening to this makes me feel hardcore like my 8th grade death metal phase… but with a little bit less screaming.
4) Attack on Titan, Openings 1 and 2
I had to put both of these because they are both full of enthusiasm and awesomeness.
5) Soul Eater, Opening 1
I seriously love the fast pace in this, it really gets me pumped up!
6) Digimon Frontier Opening ( * )
Not as many people are a fan of Digimon Frontier as of the other series in the franchise, but I am, and I really enjoy this english opening because its simple, well sung, and passionate.
7) Blood +, Opening 3
Honorable Mention:
Free! Iwatobi Swim Club, Ending
I know, I know, its an ending, but this gets stuck in my head too!
animeotakuculture 
Youtube is blocked here but I’m assuming the 3rd Bleach OP you’re referring to is Ichirin no Hana by High and Mighty Color. If so, I love that band! You will probably like their other stuff too if you like that one.
From this year too there are some pretty good ones like Gatchaman Crowds, Watamote, Beyond the Boundary, Coppelion, and Arpeggio of Blue Steel.