I'm with Chud on the width thing - a 60" Wildcat Sport was actually my first choice, and at $9k OTD, it was so damn cheaply priced that it was a no-brainer. But the more I examined the trails I ride, I soon determined that anything over 50" was going to be a bad idea. Our state trails recently opened up on their width restrictions from 50 to 58", but that still eliminates a ton of trails for any Zforce EX or wide sport like the YXZ or Rzr S.
Congrats on the YXZ. Hope they are as reliable as the typical Yamaha like the Grizzly or Rhino. I still have yet to get my ride over 45mph, but I'm also learning how different it is to go from an ATV to a SxS.