There's an excellent DVD from the Royal Opera of Alagna in RomŽo et Juliette just as he was becoming famous -- it was one of the appearances that quickly made him so, in fact. He's younger and really poetically beautiful, visually and vocally. I like the whole production and particularly Charles Mackerras's conducting (but then he does everything well; I just saw him at Glyndebourne leading Cos“ brilliantly). It doesn't have the floating bed, though.
There are several French operas from that period that seem to have one coloratura display aria for the soprano, but the rest of her role is not of that character at all. Faust is another example, and so is LakmŽ. It must make them a challenge to cast -- really you want a singer with lyrical or dramatic qualities, but the one crucial showpiece can't be ignored.