Heh. Ehehe. Soul Armor Recollect and its sequel/related game, Chimera Recollect, hits most of those points one way or another... if probably not in a format you were thinking about

Pretty sure there's been a few other games with very similar mechanics, too, though I can't recall names at the moment. The X@COM guy has a thread here in OG for one, and I seem to recall some console based things with a similar premise, if not specifically animated armors.
E:
Ah, Cogmind. That's what it was called. Want to say the Surge has a vaguely similar mechanic with collecting equipment, too, if probably not nearly as crunchy as you seem to be after.