RE: Thinking of buying an ATV recommend one!
Agree w/ Skeeter above regarding the 500cc machines. They have their place, but I can't justify one for just hunting.
For what it's worth I went w/ Honda's Rancher 350 in 2WD. Does eveything I need it to do and has plently of motor for my needs. Very nimble in the woods with good trail riding manners. Also, mine is light enough that I can easily pick up the front or rear and move it around if need be (like parking it in a corner of the garage, etc.). Best thing about mine was that it didn't break the bank at less than $3500 out the door.
Regardless of what you choose, shop around for end of year deals. Anytime after say August & Sept some dealers will be offering incentives to move the current model year machines out to make room for the new ones coming in.