The Falcon Mk II is just a ship that I built. I have tested it, and it is capable of reaching some pretty far places
The Main Booster Stage should be enough to get you out of Kerbin's Sphere of Influence
The Transfer Stage can pretty much take you to any planet or moon of your choice.
The Final Part is the actual ship itself, which can be flown in atmosphere or space. Just remember to switch between the Nuclear Engines and the Rapier Engines. It is recommended that you only use Rapier Engines for atmosphere uses
If you want, you can also add action groups to change the Engine uses of your choice.
Remember to have Fun!!!