Just depends on how serious a turkey hunter you are. I have a dedicated turkey gun. Mossberg 835 Grand Slam. Pure Gold choke tube, Nikon scope, the works. Not really an overwhelmingly expensive rig...but I've shot a lot of turkeys with it in the last five years.

Oh, but by the way... as great as my gun shoots, and its the third tightest shooting 12ga I've ever personally seen, no 12 gauge as a turkey gun will really be able to hold a candle to a 10 gauge. I've seen one 12 that is about as good as most 10s.. but thats as far as it goes.