Funny I just noticed this thread. I just ranted about firefox and its memory leaks this morning. I have decided to can firefox, and am looking for a new one.
I have been using Chrome for a while here and there, just never fully embraced it... and I downloaded safari a few months ago, but it has this annoying lag on startup, like it can't find my internet connection to load the home page. Once it goes through that process, it's lightning quick. I suppose if I could learn to live with the 20 second or so lag, it would be my new favorite. As it stands though, I am typing this in Chrome.
Haven't tried Opera for pc yet, though it works great on my phone.