My browser since 1998 is Opera! On my desktop, on my netbook, and on my phone. They were pioneers of many of the features common to all browsers these days (tabs, search from address bar, etc), and still does the best out-of-the-box ad blocking of all.
I admit, it's become a bit of a memory hog lately, but I'll stick with it for now. Chrome seems to be the fastest of all the others, so may start using it more.
Least favorite is IE. Even though it's improved, it's still the worst!