WHO'S INVITED??

Oh my... this has to be ( for me ) the hardest part of them all.
Why? Simple... How do you chose who comes and who's not invited?? For obvious reasons, family is the first in the list, oldest friends, close friends... What a mess... What if you have new friends that you feel like, they can always be your friends?
When you're doing the list, is very hard, is not that you don't want to invite some friends, is that, is very hard to chose and  you have this very long list of people, and you start planing around your close family, and what you want for your wedding. (place, season... etc. )
I asked my very, very, very close friends back home, if they were joining us, and they don't see it very possible, but is also, not impossible.
My work partners are also in the list, but, as we don't know where they'll be, or, if they'll have a holiday, or what, they are in waiting list. ( yes, we do have a waiting list! )
We have 80 invitations, and is not an easy decision. It keeps me awake at night, and i feel guilty if i don't put some of my friends, but, i try... i try to squeeze as many as i can!

Any advise about it? I can really use some encouragement about this! :) Thank you guys!