I'd like to rebuild a site of mine onto a new domain that has taken a pretty big hit for paid back-links. This was one of my first larger sites from about a year ago and I was testing out (for learning purposes) the affect of different styles of back-links.

I'd like to create a new domain and rebuild the site much differently but with the same content as the old site. What is the best way to do this without being hit for duplicate content?

I was thinking:
1. Kill the site and wait for the content to be removed from Google and Google cache? Then rebuild the site the way I want and publish the new domain.

Any input would be greatly appreciated.

Thanks,
Jesse