Well, good 'ole IE8 Beta2 beat FF3 and Safari 4 for speed, and Safari 4 was faster than FF3, so between FF3 ans Safari 4, I would rather use Safari. BUT, I'm sticking with IE8 because it is simply the fastest to me.
Google Chrome is a good browser but they need to fix it up. I still haven't been able to make it my default browser because when I click it it just won't do it. It bugs the shit out of me.
Still using Firefox 3 though. Has the most customization and plugins. Those are always handy.