Well it looks like you answered that question yourself.
I'll say this, my next shotgun purchase is probably going to be a Remington 105 autoloader. I just think it's neat. But if I'm going hunting and I know it's going to be crappy out, the 870 is coming along. And that's the weird thing about me, I like knowing that whatever gun I'm using I won't mind having it nice weather or crappy weather. The 105 would be different, it would be an upland gun that might see the odd duck shoot. But this gun would be ideal for a sporting clays type gun. It's supposed to suck up the recoil which would make it perfect for alot of rounds through a day. I don't shoot clays, but if you plan to shoot alot an auto might help you out. I've never hunted turkey, but all the programs I've watched the weather is usually quite nice, and I see no reason you'll dunk your gun. Deer might be different, but again I see no reason why an auto won't work for you. I still would give the nod to the 870, and not the Wingmaster. For a do it all gun capable of anything a pretty gun won't stay pretty for long. After a couple of years it will be scratched, dented and have the shiny bluing wore off in spots and maybe even have had a few rust spots touched up. The Express with a synthetic stock will look new for years and years, and probably look nicer than the Wingmaster after that time. Get yourself one and a full set of chokes and your off to the races, hunting or sporting wise. Put on one of those new cell recoil pads and it will help with an all day clays game too. Good luck with your choice.