I want to get a 100 gal tank in the next month and have decided to set it up for angelfish. I've been looking at them on liveaquaria.com and really love the gold veil and black veil angelfish. I looked at the compatible fish and see that guppies and danios are listed. If I go with a pair of angelfish, how many guppies and danios could I put in with them? I don't know how many gallons per fish angelfish need.

I am not sure on this but when I kept angels it was an inch of fish per gallon of water. Now with gf obviously it is different, so I would go a little more say every 2-3 inches of fish. At least this way they have plenty of room.
I do know angels can get "tempermental" so I don't think just any fish would do good, but others than the ones you just said I am not sure.

I use to keep tetras in with my angels and never had a problem. I don't know if they are recommended or not.

Whatever you decide with the angelfish, make sure you buy a few all at the same time, when they are young. They get quite territorial when they get older, and have a harder time accepting any new tank mates then. When they grow up together, they start pairs, and stay with their partner pretty much forever. That pair will then defend "their part" of the tank, in some cases the whole tank, against other angels.

Neon tetras are a no-no with angel fish. They are OK when the angels are small, but when the angels get bigger, they become food.

angels need 10 gallons per fish much on a par with fancy goldies, but the more the better. If you want you can buy a pair from the store but its best as andrea has said to get 6 to see if they can pair naturally. With a 100 gallon you could easily get 3 pairs but they would probably fight over territory so two pairs would be nice. All my tetras get along really well with my angels but the one to steer clear of are black widows which nip. The nicest are the congo tetras.