action anime, huh?
some old ones i have watched thousands of times before:
flame of recca
yu-yu hakusho (ghost fighter)
samurai X (rurouni kenshin???)
dragon ball/Z/GT
...
FMA: brotherhood (brotherhood is better than the first iteration, much closer to the manga)
naruto (seems there's no love for naruto here, but if you're tired of the classic ninja in black thing, try it)
hajime no ippo (this one is ongoing, i think)
any gundam anime (the whole point of the mech genre is to have big robots fighting)
the law of ueki (kinda weird anime, but there is quite a lot of action)
hope this helps. enjoy the anime, man (uh, miss? not sure)