What's the best method for transferring a brand new Mac OS to a new hard drive?

My mom got a brand new Macbook (she has my very old one). I’m upgrading her HD. I have an enclosure for the old HD, and another external HD (that I’d rather not use).

I need to:

1. Get the OS on the new hard drive.
2. Transfer her files from her old mac to the new one.

I want to make sure to get all the new apps that came with her new Mac (like iLife ‘09).

Here’s my plan:
* Install the new HD into the macbook
* Put the old new HD into the enclosure and boot off it
* Use superduper to transfer everything from the old new HD to the new new HD.
* Use apple’s data migration software to get her stuff from the old old HD to the new new HD.

Is there an easier way to do this?