If it were me, I'd get a Mossberg 500 combo gun, with a smoothbore barrel that accepts accu-chokes and a slug barrel. For the slug barrel, I believe you can still get a smoothbore with rifle sights, and these will shoot rifled slugs and hybrid slugs just fine out to 75-100 yds. Or, you could go with a rifled slug barrel which will shoot sabot slugs and gain up to 75 or so more yards in effective range, especially with a scope. The barrel with the cantilever mount is the one to get if you plan to scope it.
My 500 came with the smoothbore slug barrel and it shoots very well. If you typically expect to shoot less than 75 yards at deer, I'd go that way because rifled slugs cost a fraction of what you'll pay for sabot slugs.
My 500 is going on 22 years old, and has never had a problem. There are guys who could say the same about a Winchester 1300 or a Remington 870, but I think the Mossberg is the more economical choice, if that matters to you.