Why do you want an auto loader for turkeys? They are much heavier to carry, and subsequently heavier to rest on your knee during the hunt. They cost often twice as much also.
To be honest, I'm not wild about the 835 either. It feels junky, it kicks like a mule, and I don't rely on it to cycle completely half the time... but for a turkey only gun, it points well, is light and handy and MY LORD it throws an awesome pattern. All I use mine for is turkeys.
Personally, I really like the new shurshot stocks... but in my professional (I sell guns and work on archery equipment for a living) opinion and observation... there are much better choices in a semi-automatic shotgun than a supermag 1187. MUCH BETTER CHOICES!
If you want a pistol grip, in a 3.5" semi auto... that leaves you with one option.... a benelli SBEII steady grip, and since you ruled that out already.... you are pretty much sunk. But, I'll tell you... before you spend $900 on an 1187, you might ought to consider spending another $400 and getting a Benelli. This is why I'm a pump shotgun man....