Since you have long experience with your 870, but want smaller/lighter, you might like a 20ga Wingmaster?
Sticking with 20ga keeps your ammunition priced best, like 12ga.
The Ithaca 37 in 20ga fits your smaller/lighter & your familiar cross bolt safety & easier to get parts than Remington 17.
Then there is the fun of trying guns that are completely different than what you have had................
Enjoy the journey.