so I thought I'd report back that I settled on the STX MAGNUM 1800 AIR COOLED ELECTRIC MEAT GRINDER, I bought it through Mercantile Station 2 ($189 delivered), since they do repair and warranty and since it's the same price as Amazon prime, I figured I'd get it through them and be more direct (they are the main distributor in the US either way). they offer a 30 day no hassle replacement if defective and a 3 year warranty beyond that. I read reviews that praised it for it's ability to handle bones and chicken meat and I called up the seller, who also carries and does the repair on several models, and asked about which one was best for bones and they also said this one was the way to go, even though it's lower wattage than some, it has the right cutting blade/screen design to handle bones and chicken sinew with minimal clogging. so I don't have to worry about it breaking down while grinding bones, the warranty will cover breakages even if it's used for lots of chicken bones. so far, there are lots of happy user reviews out there, especially folks who make raw food for their pets, incorporating bones.
I've processed two batches of birds (28 total) so far with this grinder and it's a champ. I've had it stop a few times, perhaps it's on a timer, IDK but it started right up again. Now that I've got almost a 100 lbs of chickens in the freezer, I'm going to start reading up on all the yummy chicken sausage recipes and make some sausage!