Bookshelf

After I finally finished renovating my closet/office, I am ready to start looking for some decorating ideas.  Right now I am looking for a bookshelf but can’t decide whether to get one that would lean against the wall, or one that is mounted on. The second one would save me some space, which might be the deal breaker. Here are some examples of the styles that I really like.

I definitely don’t have enough room right now for something like this shelf, installed on an entire wall, but I love it nonetheless:)