I guess the right answer would be the one you're satisfied with. Am I satisfied with the amount of ammo I have, not by a long shot. I'm doing my best to stock up while the mayhem continues. The best way for me to solve this dilemma is to order the ammo either through my LGS or online.
The best advice I could give you is stock up on practice ammo and SD ammo for each firearm you have. You will have to determine how much you will be satisfied with.
37 People are murdered every day by the unlawful use of a firearm.
2,191 are saved every day by the lawful use of a firearm.
84,999,989 American gun owners killed no one yesterday.