back in the day I got the US Cd way before getting the London one, and singing asside, I just found the "acting" came through way better in the US cd than the London CD, Joe on the London CD too often sounds so flat and generally uninterested in what ever was going on.
As for possible concert casting/revival casting, I'd love to see Julia Murney play Norma, I love her vibrato heavy voice and her facial bone structure would make a stunning Norma
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre