Here is a link to Kellys Blue Book of Motorcycle values. ATV's are listed.
Carb models have been around since Moby Dick was a minnow.I wouldn't hesitate getting a carb model.The wife has a 06 350 Rancher and it still has a carb. My 06 Rincon 680 is fuel injected.
http://www.kbb.com/kbb/OtherVehicles/default.aspx