If you want to try a hand grinder I would suggest at least a size 22 or even a size 32. They will grind fine. Not to worry about brand, you can go cheap and get a castmodel that is plated or for a few moredollars get a stainless model. The beauty with a hand grinder is you get a big size grinder that will last and which you can add a motor to and you never need another grinder.
As far as stuffing with the grinder it will work OK on larger sized sausage such as brats ( with some practice) smaller sausages are difficult with that set up and I would recomend a seperate stuffer, just stay away from plastic gears, they work fine for large casings but won't stand up to stuffing smaller snack stix.