Can't comment on the 747-400
the 777-200 to Europe and back have PTV's with 8 channels of video plus airshow (4 channels show movies, 4 show sitcoms/news magazines/etc)
also, the 777-200 is arranged in 2x5x2 seating config, see if you can get an advance seat assignment in one of the x2 seating sections (window and aisle)
If you are flying their and back in July, you can see the entertainment selections at
Enjoy the 777, it's a great a/c!