I'm going to kick it old school:
I remember running home every day after classes let out to catch Star Blazers
Mind you, Yamato 2199
is pretty epic too.
I never caught Battle of the Planets when I was a kid, but watching throuth the series now, the Gatchaman
opening was awesome too.
Of course it doesnt hurt that Tatsunoko Production had some pretty badass Opening Tltles
And you have to admit that the Lupin the III
theme is cool too.
Leaving the 70's behind. I'd have to go with the most Manly Opening Ever: Fist of the North Star
. Warning, watching this will make you start leaping around the room karate chopping everything!