I agree with Orion (though you've already established the template-based site...) As you move forward, I have found the library items in DW allow me a lot more flexibility within DW than the templates. Library items also offer the advantage of being able to see what it will look like on the page which PHP files for example don't do.

But if you follow Wige's advice you should be golden. And you can transition to library items over time.

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