Re: Florence & The Machine
F&TM's first album, I have yet to pick up the new one, so if you haven't checked it out yet, I definitely recommend "Lungs"
I definitely get a Tori Amos/Kate Bush vibe from her.
As for similar artists, here's two I think are somewhat similar (and I personally prefer over) F&TM :Zola JesusBat for Lashes
This is another similar artist, I don't know if I'd go as far as to recommend her, but I did enjoy her first album ("The Family Jewels"), very heavy on the Kate Bush influences (everything I've heard from her second album sounded dreadful to me by the way).Marina & The Diamonds