Okay, well here's mine for Ciel. Kikuko Inoue, who has played the voice of Belldandy in Ah My Goddess, and I-No in Guilty Gear. A great, mature-sounding voice, and she has a stellar singing voice.
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Edit: As English voice actresses go that's a tougher one. Kind of leaning toward Mary Elizabeth McGlynn, who voiced Rosso the Crimson in Dirge of Cerberus, Motoko Kusanagi in GiTS, and actually sings quite well. The drawback is her singing voice is just a little bit deeper than what I had envisioned for Ciel, but there are plenty of other options there. Sharon den Adel from Within Temptation?
[youtube]wdYJDdjhJNM[/youtube]
[youtube]nHtnt2LlTg8[/youtube]
Edit: As English voice actresses go that's a tougher one. Kind of leaning toward Mary Elizabeth McGlynn, who voiced Rosso the Crimson in Dirge of Cerberus, Motoko Kusanagi in GiTS, and actually sings quite well. The drawback is her singing voice is just a little bit deeper than what I had envisioned for Ciel, but there are plenty of other options there. Sharon den Adel from Within Temptation?