Mossberg or Maverick, eihter one will work well for you. I have Mossbergs in my collection that are old enough to collect Social Security, and i had a Maverick 88 for 17 trouble free years. For the money, i would say go for the Maverick. Even with buying a PG and an extra barrel, you will still pay less than you will for the same quality as the Mossberg. See if any pawn shops or gun shops in your area have any used shotguns or barrles for the model 500. They will fit on the Maverick.
If I have to explain why I ride, you wouldn't understand. Explaining sex to an alien would be easier than explaining the feeling, one that boils all that is going on in your life down to what really matters each time you are in The Wind. All I can say is, Life is not Life without it.