The 400 has a great rough water ride and would be the perfect canyon day boat. I had the pleasure of fishing our 400 Open TE up in Mississippi on November of last year for Kingfish and we made 90+ mile runs out each day and never felt uncomfortable when it got rough out.
I have only seen one for sale, but it was a few months back. Try giving a call to our sales office in Dania 954-922-7544). They are usually the 1st to get the phone call about an owner trying to sell or trade their boat.