I agree with (almost) your choices. Actually, there are too many to mention.
My list:
Madonna (is she a singer? really?)
Beyonce (she is pretty, ok)
Jennifer Lopez (agh!)
Lady Gaga (omg!)
Britney Spears (her voice, when only *speaking*, is already atrocious)
Celine Dion (run, run for your life!)
Mariah Carey (wow, she is hot!)
Whitney Houston (amazing voice, but her "melismas" annoy me)
Janis Joplin (ouch, my ears!)
Most female opera singers - usually you can't hear the words, because they think that singing opera is lots of vibrato, and pay no attention to the real meaning of the text. You just hear "garble, garble, garble" and lots of vibrato.