For me, I've found the best value in having two scales. I have this one for smaller items. It goes to the nearest tenth of a gram, so that's good enough for me for smaller quantities. This is good for jewelery, small coins, etc.

For weighing a whole stack or something, I also have one of these. It's only accurate to the nearest gram, so the small one is better for small quantities, but this one supports up to eleven pounds and is definitely the best you'll find for the price. I also measure stuff other than my stack on it as well, so this is a decent multipurpose scale.