The Kawasaki Brute Force 650 4x4i !
Just got it and made a test drive on it, after having a TGB Blade 425 LE and a Yamaha Wolverine 450(which were both great ATVs) this is just of the hook.
It's acceleration, suspension etc. it's just amazing.
Tried how easy it was to do a wheelie with this one and almost ended on my back with the ATV/Quad on me as you don't to take any effort at all.
Anyway here a link to it, we got exactly the same one as showed there.
http://www.kawasaki.com/products/product-specifications.aspx?id=328&scid=1