What Do You Consider A "Complete" Set

Interesting question here, but I say that your set is complete when you say it is. Some people make a set of one coin for each date, some people fill albums, whatever it is that you do is your business. This is a hobby and no one can tell you that you are doing it wrong.
As far as what I do, I like dansco albums but I DON'T get the ones with the proof issues spots
I have heard people say those are "needed" to complete the set, but I just shrug it off
My sets are finished when I can't afford to finish them! Some times people are lucky enough to find semi keys and key dates, but when people start paying thousands for coins it gets kind of crazy. I know for a fact I will never do that. How many sets does that leave me completing? Jefferson nickels, jfks, franklins, Roosevelt dimes, maybe Buffalo nickels or Washington quarters. The thing for me is to have as much as I can get of it all, always striving for the finished set. Hey you never know what will show up