Don't spend the extra for the supernova... I own a nova and one thing I will tell you is that it is the best gun for the money I've ever owned... I have a Browning A5, Browning Maxus, Browning Gold Hunter... and have had problems in the cold with all of them!
Your a bigger boy than me 170# and when the adrenaline kicks in when those mallards/geese are getting skinny you don't feel a thing... the action is a bit mechanical but tolerable. I've dropped mine in the lake, dumped out the water, and boom..boom...boom... no problem. I too got mine when money was tight and I wanted an economical goose gun.. but what I got was way more than that. I bring two shotguns on every trip and the Benelli Nova is always one of them. It has never let me down and never bruised my shoulder even shooting 3 1/2...
Don't be afraid of the low price and the assumed lack of "bells and whistles" the Nova is a great gun and I would never tell anyone to think otherwise.