Here's a link to Remington's web site.
www.remington.comFor what you want, a Remington 870 Express would be a good choice.
The Express is Remington's "budget" priced gun. It has the same steel receiver and heavy duty parts as the more expensive Wingmaster or Police guns, but doesn't have the high polished blue finish or fancy walnut stock of the Wingmaster.
Remington sells several "combo" models which come with two barrels, one longer sporting barrel with screw in chokes, and a shorter barrel for slugs or buckshot.
They also sell two guns for home defense, listed un the Express with 18" barrels.
One has a standard length 4 shot magazine, and the other has an extended 6 shot magazine.
These are perfect for defense, but would need an extra, longer barrel for hunting most game.
Although all Remington 870's are chambered for the 3" Magnum shells, and they do make several 3 1/2" Super Magnum guns, MOST shotgunners shoot standard load 2 3/4" shells, and many are shooting "Reduced Recoil" shells for home defense.