I seem to have stopped listening to music actively but when I was interested I only listened to the Kate Bush or maybe Ecto genre. At some time the top favourites after Kate Bush was Happy Rhodes, Jane Siberry and Loreena McKennit.
Here is a good guide
http://www.ectoguide.org/
to music that people liking Kate Bush and Happy Rhodes also seems to like.
This guide will probably explains what I mean by Ecto genre.