oh god so hard to chose >.<
3.Kekkaishi opening
http://www.youtube.com/watch?v=36QddwlM7yMthe song was actually made for the anime, so it completly fits the anime and i love it, and just recently this anime got english dubbed

2.FMA opening 4
http://www.youtube.com/watch?v=nbjz6Z-0-0Ethis opening was my favorite for such a long time, i love the song, and it fit so well, and it always got me pumped up for the final episodes, which is what a opening should do (and most don't)
1.Angel Beats opening
http://www.youtube.com/watch?v=drJSU2FZqjwi don't know why i love this one so much, but i do like that it had added characters into the clips as they were intoduced (the link is the one from episode 2, the most basic one, couldn't find one from the later ones with Naoi, Takeyama, and Yui)
honorable mention goes to bleach opening 2 and Soul eater 1 as i had to mention them because i love them too