[NO SPOILERS] Watch the show, but want to start the books. Suggestions?

Hi guys! So I'm completely up to date with the show and I'm getting a bit sad that it's ending soon so I decided I want to read the books.

Now my dilemma, as is with many of you is that since the book series isn't finished, I don't know whether to start it or not.

Should I read maybe A Knight of The Seven Kingdoms first and then start with A Game of Thrones?