DON'T USE GHOST, except for Windows.
Everyone uses uses Carbon Copy Cloner ( CCC).
Cloning a Mac drive is the easiest thing imaginable. It's nothing like Windows. Two reasons for this:
1) No copy protection. This means you can run the same image on any number of machines. This makes life much easier.
2) You can run any of the clones off any external drive (Windows will only run off a internal drive): For instance; now with Thunderbolt you can clone your OS in a couple minutes, and then run it permanently off thunderbolt, as it's faster than your internal drive. You can run your OS off Firewire, USB, or Thunderbolt drives. You can also use a USB 3.0 drive if you have an express card adapter and the right drivers.
Also, since Apple makes it easier, the programs that do make clones (CCC), have a much easier time doing it, so they are very easy to use and are extremely reliable. Plug-and-play, so to speak.
Having said these things, you should of course always pay for everything, as it's not expensive and it makes you feel better.