This logo is great because it rejects convention just like Black Sabbath. The waviness of the words gives it motion, and the winged people on either side give it a hellish look which I like.
Led Zeppelin is also very cool.
This is very nice because it communicates the image of a son coming over the sea in the simplest way possible. 
I like this logo because it smartly uses the R to complete the Q, which catches your eye and makes you go AHHHHH.
I like this one because it uses the figure of a man to also represent a 9, which is in the name of the brand. This is clever.
I like this one because it creates a sense of depth, and is very aesthetic. The color is also very soothing.
I like this one because it also uses an object to communicate a number that is in the name of the brand. It forces your brain to do a double take.