My Brother and I had a discussion the other day concerning kids and their first shotgun. Your first gun experience determines how you will view, use and enjoy guns for the rest of your life. Especially when it comes to shotguns. With that in mind, if I buy my kid a gun and he/she never buys another gun for the rest of their life, what should they have? Also, I want my kid to love guns so they will want to shoot more, so again what gun helps ensure this?
Now since life is priceless, cost is not an issue.
My answer, any M1 field gun. I am not prejudiced, because I do not own a single Benelli. The final tie breaker, when in the field or shootng clays, a novice shooter will have a much easier time changing loads, say from 7.5 to 6, or 7.5 to 8 with a Benelli. Same for switching from buck to slug in a tactial situation. Load any gun and an M1 side by side with the same load. Now switch each to a different load in the chamber.
For a pump gun, 870 all the way. An Express combo with two barrels would be cheap and handle well. Add mag extension.
Even better, buy 2. 1 can be an old 2 3/4" chamber, fixed choke if you do not have to shoot steel shot. The other an express for tactical gun.