Once you rip a commercially made blu ray movie to the hard drive, it is still in blu ray format, it simply does not have the copy protection anymore. That is removed by AnyDVD HD unless you specifically choose to leave it in (don’t do that by the way).
So, there is nothing wrong or even changed about the format of the movie. It should burn straight to a BD-R or BD-RE disk of the correct size using ImgBurn and the UDF 2.5 setting. If using 50gb BD-RE, you’ll have to format using ImgBurn beforehand, and the very first format has to be a complete format…which will take a very long time. Go to Tools–>Drive–>Erase disk (same as format in ImgBurn)–>Full erase. Or you can hit the little disc icon with red in it on the main window of ImgBurn to do the same thing.
I would suggest using Japanese made 50gb disks for now. I’m not sure if Verbatim is offering them yet.
The regular Verbatim 25gb disks are fine, but I wouldn’t use their LTH 25gb disks unless you are certain that your burner and ALL of your blu ray equipment is compatible with the LTH disks (they use organic dye instead of an inorganic burning layer).