Expression Engine: Help with RSS import plugin

I have an Expression Engine blog at [login to view URL] and a Posterous blog at [login to view URL] I'd like to use one of several EE plugins (I need you to recommend the best) to import each new Posterous entry via RSS as an new EE entry. Images will need to be included too. To avoid a Google PageRank penalty for duplicate content, I plan to then make the Posterous blog private. I'll also need advice about whether or not that is likely to be a problem. Thanks!