controller.com has a 2008 with 0 TT for $55million. that's probably base. There's a 2005 on there for $59 million. Which plane depends on the mission. I don't know the specs for a G550 but I remember hearing from a GV pilot that you can fly from KLAX to LHR and have KJFK as the alternate. I doubt a BBJ can do that. (Note, I didnt' check the accuracy of this). Same can be said for why get a King Air when you can get a CJ1+. Well the Pilatus can carry more and is much less expensive to fly and (a guess) much easier to get it certified for single pilot.