What is your opinions on using a 20 gauge? A local store has some of the Benelli M2 Performance shop models in stock.  I picked one up and was just  

Probably the best feeling shotgun I have ever handled.... I am about to come into some serious bonus money and have been itching to buy a high quality shotgun I will never get rid of.  
These come from Benelli supped up and hand fitted and had chokes matched to the gun.  POA/POI perfect from the custom shop.  
So what do you all say?  Will be hunting mostly flooded corn fields/timber