Gierkin

Hey I have shot a lot of trap and a tiny bit of sporting clays. But I have always used someone else's gun. I am now in the market to buy a shotgun but not really sure what to get. I want to continue to shoot trap and sporting clays but also want to get into hunting. i.e. deer, duck..... I have shot a Remington 1100. and enjoyed that a lot. But it is a little pricey, especially with the other things I want to purchase . I was thinking of a remmington 870 or Benelli Nova Pump. Just wondering what you guys thought was best. and also what do each of the chokes do. When I shot trap I never used one. I am much more familiar with my glocks than a shotgun so just looking for some advice. Thanks