Personally, I would get a Remington 870 Pump with a shorter barrel. That would serve the purpose as a HD shotgun (with a nice short barrel), but you could also take it to the range for skeet or trap (or even hunting).
Remington makes a 21" 870, called the Turkey model, and it comes with an extra full choke that can be replaced with any of Remington's chokes...I would replace it with an improved cylinder choke for HD and skeet, and get a full or improved modified for trap.
I am actually planning on getting this exact model sometime soon!
The model number is 25573...check it out.
www.remington.com/firearms/shotguns/870extrky.htm