My advice, if you can afford it and really want that SKS, is KEEP the Mossberg 500 for home protection and buy the SKS for, well, whatever.
Despite all the firearms I own. The one I make sure I have ready at hand when I go to bed is my trusty Mossberg 500. It's not the cheapie Maverick. But if a BG decides to break in my house at 3:00 AM, he'll get carried out with a load of 00 or #4 Buckshot in him.
To me, the Mossberg 500 is an ideal shotgun. I carried one (with permission) for years as a LEO instead of the Remington 870 that was issued. The main reason was the Remington had the safety behind the trigger, and since I shoot from the left shoulder I had to reach through to put safety off. The Mossberg has the safety, where IMHO it belongs.
Just my $0.02 (US)