I know people have their own view as to what gun they like best.

I was wondering if there is a ' best around gun' for partridge hunting. Is it 12 ga? 20 ga? Is it a O/U; SbyS; Auto; Pump? How about a Manufacture?
I have made a decision to buy a new shotgun this year for bird hunting. The only thing I have decided on is that it has to be a light weight gun, under 6lbs. I love walking in the woods and want a all day carrying gun.
What would you recommend?