The size of the patties you are going to make really should be determined by the size of the bread you are going to be putting them on. Also remember that the higher the fat content of the meat the more the patties will shrink as you cook them. If you are using 15% fat or higher make the patties larger than the buns, otherwise the same size as the buns will work best.
The other point is that you want all the patties to be the same size so that they will cook in the same time. You don't small overcooked burgers with large undercooked burgers. By taking a ball of the ground meat and holding it in your hand you will get a feel for the size and be able to make all the burgers the same size.
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