CEH Training?

Hello I am going thru CEH training right now and they have the labs online for the course. I am wanting to setup my own lab with a server I have in our office. It is a rack mount server right now I have Ubuntu 14.04 on it and it is doing nothing in our office. I can reuse it for anything and have the ability to reload it with any OS in your opinion what would be the best setup for the lab? Thanks I have setup a lab in the past using VM ware on the server I just want to get your ideas on this.

-Tombstoner