Hi Bundy
The Avanti is a great board for the big man!
I began my SUP career on the Avanti and loved it.
My buddy who is your size, and owns a SUP shop, has the Carbon Avanti and absolutely swears by it.
I rode mine in big hurricane surf and 1' beachies... it surfed really well in everything.
Don't let the width put you off, it turns easily and you will love the stability.
The only thing I didn't like was the weight of the AST.... if you can find one... get the Carbon