If you want a fun machine go with the maverick or rzr 1000. Just don't get the base model. When you have it, get the shocks reworked first. If you're gonna use it for work, go for the commander. If you have a bad back, don't get anything else.
I'm partial to can am, but they are both fun. Maverick 1000 turbo is next on my list. There are some good used mavericks available, just be sure they haven't been run through the mud (high hours/low miles).