Newbie. Need purchasing help / advice

I’m currently in the market for a quad. I have been riding dirt bikes and trikes for 20 years. Looking to switch over to atv. My budget is around 5k. The dealer is selling a new sportsman 400 for right around my price range I just don’t know I’m better off buying a 5 year old 500 or a 600 for the same price range. Going to use it for mud and trails with the kids. I’m under 200 lbs. Is a 400 under powered ? Will I regret it ?

Thanks for the advice