Need some help deciding what machine to get. I currently have a 2011 rzr4 800 and love it. I do all my riding in the mountains of Colorado. I have not driven either machine, but need some input from those that have them. I have a family of 4 so I have to have a 4 seater. My father in law drove a new 900 4 and he said that he was disappointed in it. He said its basically my 800 with a detuned 900 in it. Please help!