Rudy Giuliani gets way, way too much credit for the decrease in crime in NYC during his term in office. If he's really going to go after big crime (corporate things, drug cartels, etc) then I might be able to stomach him as Attorney General. But if he want's to encourage stop and frisk type bullshit on a national level (I'm not even sure he can do that) I would be very, very worried.
Treasury - probably Steven Mnuchin, another Goldman Sachs guy. Trump may not be as anti Wall Street as he said he was.
State - Bob Corker (Senate foreign relations chair) or Newt Gingrich. Both are long-time Washington insiders.
Defense - about four candidates, mostly long-time Washington insiders.
Attorney General - Rudy Guilani, probably. As a prosecutor, he took down the New York Mafia, so he's qualified for the job.
Old, white, Republican insiders, all of them. Mnuchin is the only one below retirement age.
[1] http://www.politico.com/story/2016/11/who-is-in-president-tr...