What files should I transfer back to a clean install of mountain lion?

Hi,
I have a 2.4 GHz core 2 duo running snow leopard. I want to upgrade to mountain lion but want to start with a clean install. i have everything backed up on an external hard drive. My questions are this: what files should I transfer over from 10.6.8 while leaving the old junk behind. I will reinstall only the compatible apps later.
My second question should I use migration assistant or set-up assistant? I can't seem to find the necessary tutorial that is straight forward for this.
Any help would be appreciated.

If you're doing a clean install, which usually isn't necessary, then you want to bring over as little as possible. You can use Migration Manager in Setup Assistant to bring over your Accounts if there are no problems there. (If there are it probably accounts for the issues you're having and you'll need to troubleshoot your Home folder.)
You'll probably want to leave settings behind. Applications you already said you would install later.
The reason to run Migration Manager on the Setup Assistant is becuase after that it tends to create a second Home folder, which is not helpful.
Be sure you have a good backup before you begin.

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