well if you want something
Different and kind of FUN
try a Russian Saiga Shotgun in 12, 20, or 410
they are semi auto MAG Fed shotguns, built on the AK reciever, these are real Russian AK recievers modified into shotguns. the only one you can get as a civilan in the US is the sporting shotgun with monte carlo stock and 22" barrel, heres the pic
http://club.guns.ru/eng/sig12/3.htm
they also have a combat saiga 12 for the russian special forces "spetznats"
http://club.guns.ru/eng/saiga12.htm
bad part is the mags are expensive, plastic and hard to find, but durable. also the barrels are Fixed, not removable like a remington 870, so if you cut the barrel down to 18" it stays that way forever.
another GREAT thing about them is that they have a side mounting plate -- so you can buy Quick Detachable russian scopes and Red dot sights
cost is $300-$500 depending on caliber/gauge
i like my 12ga, and bump fired my brothers 410 saiga -- the WORST part of these guns is that they are now classified as Kalif AW's