I still say the fastest browser is Opera. I sometimes use it's built in e-mail client, you can add a plug in for spell-checking, you have advanced mouse clicks, its something that just keeps improving over time, much faster than IE. But I will say, I do like Firefox, its missing just a few of the feautres of Opera, but does a little better job handling some websites.
I hear great things about Opera, but I detest ads and refuse to pay for functionality I can get free elsewhere.