You are correct and that I liked the last one best. #3 is good too.
And the band that I linked actually has a few different styles and their lyrics are always quite odd.
I saw this post in the freeza thread, http://gamrconnect.vgchartz.com/post.php?id=8466870
well here is a song for him :P. Non-spoiler
This one is the same thing but very well made with lyrics and spoilers so beware if you care about that.
Yeah, I think DBZ has a lot of metal music, doesn't it? At least they used a lot of hard rock/heavy metal in the English versions of certain films, I believe.