Awesome pump. You could go with a 18 or 20 inch maverick 88 and install all of that for less as well if you can't budget for the 500. I'd go with the foldable stock version of that. Very awesome brother 👍🏽
You can add all that to a rem 870, probably for more since 870s tend to cost more. But you can't go wrong with either. I'd say 870 only because it makes more sense where the safety is for a pistol grip stock. Maverick 88 has a similar safety to 870 but still a 500 a cheaper price👍🏽