One grammar book which I really like is "Grammar in Use" by Raymond murphy.
In your case I would get the pack which includes the book, cd and answers. That way you can photocopy excersises for the students and use the cd yourself in class. It is a great tool. I love it. It is also great for giving as homework after you cover a grammar point in class and with the cd you can do many activies in class. (Each grammar point has an explination page and then an exercise page. :) There are three different levels as well so I assume you would start with the first level.
You can buy it online or in most book stores. I think this would be great for you and your students.
Let me know how it goes and if you get the book or not (if not...what did you end up getting? I always like to know about new books!).
All the best,