I have two 870's - a 12 and 20 gauge. The 12 gauge is a Wingmaster, and I highly recommend it. However, mine has interchangeable chokes and I don't recommend a full choke for much of anything outside of a few hunting applications.
I'd say Remington and Mossberg are equally reliable and suited for home defense (and hunting as well), but I find the 870 more aesthetically pleasing.
As for the others, I haven't heard of a Maverick but I'm suspicious based on the price. I've handled a Nova but not a Stoeger.
If it were me, I'd decide between the 870 and 500.