Might want to look into a decent pellet rifle too, some places it might be "more legal" to shoot a pellet rifle than a real rifle. Obviously not for the bigger stuff, but for the oppossums and whatnot, a .22 pellet rifle is adequate.
I love my .22 caliber pellet gun. I'm in town limits and these new air rifles are not toys by any means. My Walther Talon single pump pushes a lead .22 cal pellet 1000 fps. For a bit more money you can have a sport shop order it from the factory with the gas piston instead of the spring. Much less jarring and sound with the piston.