I want to be a giant robot spider. That's pretty much it. Put my brain into a giant 10ft tall robot spider, with maybe some missile launchers or lasers or something.
Though I wouldn't try to take over the world or anything like that. I just think all my accomplishments would be way more bad-ass if you added "The first giant robot spider to..." in front of it.
For example "The first giant robot spider to graduate from Medical school"
And nobody would ever cross me, they would either be my friend out of fear of being destroyed, or they would run away, again out of fear of being destroyed.