if you alread have an 870, you may want to get the 870 super mag as your next gun. it should feel the same, handle about the same, use the same choke tubes, and fire 3 or 3.5 inch shells.
I' ll second that. I have the Remington 870 SPS in 3.5 mag. It shoots like a dream and the 870s take a lickin and keep on tickin.