everything ORIGINAL that is on this planet from the Godfather, is on the DVD box, the only 'but' is, that the extra scenes are apart from the movies, on the bonus disc (as you found out already). some of them are quite good and add a lot the movie for us 'fans', but you can't see them in order with the rest of the movie.

So if you want to see a four-hour all-in version of the first Godfather, don't expect to see it with the DVD box. as for anything else, the DVD box has all you can ask for.

I believe one of those two VHS-sets you mentioned has the entire franchise in chronological order (starting 1901 instead of Bonasera's "I believe in America"). can be nice for a change, but remember the original movies (the second especially) was intended to be a two-story-cross-cut-masterpiece.