My answer would be Iron Man. All the wealth and influence of Batman, heading a military contractor/energy company. Bruce Wayne may have to build his robot army on the down-low, using his own ingenuity. Stark could do it publicly under the guise of a military contract, then beat down the military itself with them. Heck, he could pretty much just build that army using the Iron Man suit design. We've seen his armor go self-aware before, it can be pretty brutal. Imagine an army of those, working for Stark. He could even use them as Nick Fury-style body doubles and hide out. I could see his motivation working along a similar vein to his motivations in the Civil War event; thinking that he's protecting the world from destruction by taking over, not realizing that he would be turning into the monster he was trying to stop. I could see it working pretty well.
He would rule *puts on sunglasses* with an Iron fist!
YEEEEEEAAAAAAAAAAAAHHHHHH! [http://instantyeah.org/]