if you go the used route look at the remington 1100 magnum.I bought it used for $300. I have used it for the last eight years with out a problem.make sure it is a magnum this will allow you to shoot three inch shells.If you have the bucks($1300) look at the benelli i think it is model 391? just go to your nearest dealer and ask for the semi atuo.This has to be one of the lightest and fastest guns on the market it will be my next shotgun.three of my freinds shoot these and they have had no problems.
_________________________
see ya on the water.