I've actually looked into the Outlander 400. It looks super nice but is on the expensive side of things. I've heard those Rotax engines are true beasts. Thats what they use in ultralight airplanes.
The used quad scene around here sucks. Lots of older 2WD quads but most of the newer late model quads are prices at or near what I can get a new one for. Paying an extra $500 for a new quad vs one thats 2-3 years old is money well spent in my mind.