welcome to the forum
i can not speak for any semi auto shotguns, but i have about 10 pump actions.
If money isn't a problem, go on and buy a nice semi. Just remember, as soon as you shoot there is another one in the chamber, so be sure to flip on that safety as soon as your done.
I can suggest a couple shotguns, ones that everyone knows and are known to best the toughest and best priced shotguns, the mossberg 500 and the remington 870.
You can find great deals on these anywhere. They usually include a rifled barrel for sabot slugs. A pump action in the hands of someone who shoots often will shoot almost as fast as a semi.
glad to see new hunters on the forum.