For what you want out of it, Mossberg might be the way to go. .410 is a light kicking gun, but it is expensive ammo wise. If you won't shoot it that often, I would go for it! But, 12 gauge ammo is relatively cheap to other shotgun ammo, IMHO.
Good luck with the buy, check out mossbergs sight! If you don't know a lot about shotguns, I wouldn't go for a used one the first time out. Try to find a bargain one when you've had more experience, or if you know someone that is experienced.
"I only regret I have but one life to lose for my country" Nathan Hale
Amendment 2 - Right to Bear Arms. Ratified 12/15/1791. Note
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.