On my opinion, there is only one "nice looking" Mac OSX browser: OmniWeb. But its technology is now too old and slow.
My two main browsers are Chimera for its speed (Speed Lightning) and Explorer for regular work. I switch to Explorer Classic for some specific jobs with Java, or to Netscape 7 but more rarely, or Opera Beta 4 for pages that I want with/without image, as I can switch in the tools bar.