This probably isn't the list you want, but may have information that you can use.
The size listed is for the main movie, and all extras. Many movies listed here as recorded on a BD50 will have a main movie that will fit without compression, but there is no way to tell that from this chart. If you click on the individual movie you are interested in, you can see the actual size in gigabytes for the complete movie on the disk.
By the way, this thread is in the wrong forum. I can move it to the Blu ray Hardware, Software and Media forum if you like.