Your first header <header>Total news</header>
would be a simple <H1>
.
The <header><h1>News</h1></header>
would be <hgroup><h1>News</h1></hgroup>
(In this example you dont really need that container)
You also should think about your usage of Tags. You don't have to use all of them just because it's the 'correct order'. The less tags you use, the better.