Remington 870 our mossberg 500 would be your best bet. The 500 is lighter and the safety is in an ambidextrous spot so if you are like me and left handed thats a plus. Now I own an 870 and I wouldn't trade it for the world. And if you have a kid (depending on age) the mossberg will be easier to familiarize. both have an abundance of aftermarket goodies. One thing I would advise which ever way you go, don't go pistol grip only. The stock places the recoil in a more manageable spot than just the wrist.
Remington 870 12 Ga. Supermag
Springfield XDS .45acp