MBP: Install SL to external, backup, restore to internal?

[Breeze]

I'm still running Leopard 10.5.8 on my Macbook Pro because the last time I tried a straight upgrade of my system to SL it was a disaster as about a third of my work-related apps had problems with it. I recovered my system via TM (which was really slow, but worked) because my SD image is on a network share. So this is what I'd like to do now:

1. Install Snow Leopard fresh on an bootable external HD.
2. Over a few days or weeks, install all my additional software there.
3. Once I'm satisfied that everything is working ok, then make a backup of this SL install on another bootable external HD.
4. Erase the MBP internal HD and restore the external image to the internal drive.

So: can I do this with SuperDuper ? If not, what should I use?

If yes: what are the best settings and procedures to use for this to work?

Thanks!