Congrats on choosing the Remington 870!
I have noticed many of the newer home defense 870s are coming from the factory with shorter forearms, I know mine did and I was able to install a 6 round side saddle without replacing or cutting the factory forearm like I had to do on my first 870. I really like the Hogue rubber forearm as it provides a good grip even with oily hands. If you're going to get a light for it, make sure it is LED because the incandescent bulbs can't withstand the recoil of the 12 gauge.
This one in particular came with a really cool digital camo forearm and stock. I took the stock off and put on the Knoxx Spec Ops stock. I think Remington is only running a limited number of these.