Mossberg 590 mariner with slugs. It will reach through things and out to over 200yards. Its cheap enough and won't rust much.
Ak47 underfolder is another great choice. Tidy compact and who cares if it rusts a little its a cheap piece of ruskie junk that holds 30 rounds of get the hell away from me so I can get home alive....
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent