Better to publish my article on eZine, etc or just to my own website??

[bobo.cx]

From an SEO perspective, if I write an article (all original content), is it better to publish it to my own website or to a site such as eZine Articles that offers a backlink?

I've heard it can have a negative impact if an article is posted in more than one place so I'm wondering if I need to choose one site over another or if its better to submit the article to multiple sites including my own?

I know the eZine article posting will contain a link back to my site but didn't know if its affected if I also post the article onto my own site as I can use all the fresh original content I can get in Google's eyes.

Thanks for any tips!