Check out this web site for reviews on the new ATV's. The closer to 5 the better the review. Check out the main brands only since some of the lesser known bikes don't have enough reviews to compare.
http://www.powersportsnetwork.com/en...eview_list.asp then hit atv in the drop down box.
I have a 2006 Suzuki 450 King Quad and it has a strong engine, electronic fuel injection, independent rear suspension and a locking differencial. Great bike and it works out on the ice and in the woods flawlessly. It has good clearance for deep snow or mud travel and lots of great features.