You're opener is quite crude. Didn't think you were actually asking for anime suggestions.
Nausicaa of the Valley of the Wind is probably my favorite, though I don't think you can go wrong with anything from Hayao Miyazaki.
Code Geass is fantastic.
Vampire Hunter D is a unique little piece as well.
Cowboy Bebop is really worth watching.
Many, many years ago I recall watching the Galaxy Express 999 series. I have fond memories but I think if I rewatch them I'd be disappointed.
I prefer the anime I watch to make some tangible sense....the 'what if' needs to be present. Having people in random mechs or training grounds just to fight without any sense of plot just doesn't strike me as good. Escaflowne is a borderline example of this. The setting is absolutely facinating, but the plot device in which you follow the main character around with....simply isn't.