I had a Polaris Sportsman 500 a year ago and traded into the bigger 700 twin this year. I have nothing but good things to say about the polaris quads that I have owned. I guess it all depends on how much you want to spend. you can get a used quad for under $4000.00 that will haul all the dead deer you can get your hands on or spend over $10,000 getting a new, big-bore quad with all the goodies....okay, mabey not ALL the goodies.
I personally like a smooth ride in a utility quad, Polaris' independant rear suspension rides way smoother than the Yamaha and Kawasaki quads I rode in the same engine class. I have never had cold weather start problems with it, always been very impressed with how much it can tow/pull, and it pushes snow like a champ. It'll hit 65 mph if you want it to, climb about anything you ask it to and frankly, looks good.(camo of coarse) Like I said, price will probably be the deciding factor... I don't think you can buy a "bad" quad anymore, it's probably more a question of how much you want to spend.