The looks ("sitey" or "bloggy") of a site is not determined by whether you use posts or pages, but by your theme and whether you use a static front page or not.
Use posts and you can categorize.
Then you may ask questions on how to have this or that effect or functionality using posts. There's always answers to that, because there is nothing with pages that can't be done with posts. The very definition of pages is that they are like posts, without taxonomies, publishing date an author. Posts may even be put hierarchically into a navigation menu.