http://www.hr1871.com/http://www.varminthunters.com/tech/nef.html - ignore the NEF link; H&R makes these now anyway,
Frequently on sale in my area for $200 or less, and H&R will inexpensively fit additional barrels to them.
The rifled-barrel shotguns are very accurate. I have read that the rifles are more than accurate enough.
The Rossi's that we have used have been fine. Others (at least one poster here) have NOT had good experiences with the Rossi. You know the nightmare when you pull the trigger and all you get is a "click"?