If I still lived in MN I'd take the 870 off your hands, if it was a Wingmaster. I've had 4 and am down to 1 which belonged to my father. I just sold a skeet gun which I should have kept but never shot it.
I have a H&K Fabarm Camo Lion but don't know if it comes in LH. Get what you want but try to get something that is LH.
I get bit by SxS's, kept my BSS but sold the Parker Repro SSS - kind of wished I kept it now but that is a lot of money to have invested in a gun one doesn't like shooting. I pissed the money away anyway, although I did use some of it to buy the Camo Lion.
I've got a nice o/u for trap, just looking at something more lefty friendly for a home defense shotgun really... I have no issues with the 870 other than the reverse safety and the stock slapping me in the face. It's a solid gun, and a good shooter... I just want to try something else and have handled the Mossberg, feels good in the hands and easy to work.