A lot of guys will point you to big units…. and that can be fine, as there are some beast out there that will go through almost anything. Consider how you plan to transport it. I still put mine in the back of my truck, and with the mid-sized box, I can close the tailgate. I have a 450cc Yamaha… but anything larger, or with larger tires closing the tailgate is no longer an option.
Unless you are really going to pound the unit with thousands of miles, or heavy off-road use, it is hard to buy a bad new atv now days. If time is on your side… looking for a slightly used model shouldn’t be too hard either. A lot of us guys out there that use them a half dozen times a year on the ice, and take good care of them. Mine didn’t see dirt for the first four years I owned it.
While a lot of the non-current new stuff has dried up, there are still some great deals out there at dealerships. Years ago when the economy first tanked, there were a ton left over. Through auctions and manufacturer dumping, some huge discounts were around… and some of those are still available. I work with a couple dealers that occasionally still get these new units even now.