I want to get a good quality double-barrel shotgun, either over/under or side by side, for hunting and sporting. I'm interested in skeet/clay shooting, trap shooting, upland bird and turkey hunting, and possibly home defense. This is my first ever shotgun. Is there a general double-barrel shotgun that fits the purposes mentioned above? Which gauge is more useful? 12 gauge? How about interchangeable barrels? Chokes? Also, what's the optimal barrel length? 28" or 30"? And weight? Some brands have "light" version in 6 to 6-1/2 lbs while the majority weighs 7 to 7-1/2 lbs. What quality brands/models would you recommend? Winchester, Browning, Ruger, CZ? I know double-barrel is expensive - anywhere between $800 to $2500. But I intend to invest in a quality shotgun. Thanks for your inputs.