If you want your theme to be easy to understand and to locate the tpl files you will need to order them in folders.
The best choice is to separate them by node, field, block, view and other folders. So your node.tpl.php files will be located in the templates/nodes folder for example.
Another way to improve your node tpl files is separating them by node type. If you want to theme the blog nodes you will need to create a node--blog.tpl.php file and make your changes in it.
On the other hand, if you want to theme the node full view and the node teaser view of your blog nodes you could do