I've been looking at them all myself and "plan" to purchase one this week. My main use is to ride around my property with the wife and 2 kids, so I actually wanted as much cab space as possible. I also want it to be sporty enough for the wife and I to hit the trails with friends on occasion. My buddy has a new RZR 1000. I really want one but can't justify it as it's very difficult to cruise around the farm with my kids and has no utility function whatsoever. But man is that thing a power house and an absolute blast to play on!
After months of reading, I was dead set on a new Yamaha Viking. Wife and I headed to the closest dealer that had the configuration we wanted with the intent of bringing it home. After taking a ride ( dealer actually had some off road trails in a field), we just couldn't find anything we liked about it. Seat was too far from the dash for our height (5'4"-5'10") and with no tilt wheel, it just wasn't comfortable and I felt like I was constantly reaching for the wheel. The thing was so loud we couldn't even talk to each other at cruising speed, and really shook at an idle. Overall it just didn't seem to have the power of the older Rhino's I've been in. Not knocking anyone's decision to get one, but it wasn't for us. It had some really nice features such as the engine brake and separate parking brake that really lead me to it.
Next we looked at the Teryx. The twin cylinder engine was much smoother and quieter than the Viking and had great power. We really liked the look of it as well. I would have bought one if it didn't have the console in between the seats. I absolutely have to be able to slide my kids in there and don't want a 4 seater as I do need it to have some utility use without being as long as a vehicle.
Lastly we drove the ranger 900. Wow, that thing was a beast! It was the quietest of the bunch and seemed to fit us perfectly. Only problem was they didn't have the configuration we wanted, so we wait. Should have a 2015 in this week. Hopefully I don't talk myself out of it before they get the one I want, I am really good at doing that, and it drives my wife crazy.
Recently rode in a new ranger 570 that belongs to a neighbor while putting up hay. It was a nice machine and perfect for cruising between fields and just getting around, it would serve is very well, we just prefer the larger size of the 900. I believe the price difference was about 3,000.
We didn't look at any of the Kubota's or more utility type machines, as we absolutely want the sportiness and extra speed of the Ranger, Teryx, or Viking.
Good luck in your shopping, and make sure to drive all of the ones that seem to fit your needs. It's amazing just how much different each one feels.