I give equal time to two browsers — Firefox, because of Firebug and Greasemonkey; and Opera, because of 90% of the positive difference between Firefox and IE + super-quick launch speed.
I tried Chrome, but its “speed” comes as a result of prioritizing what it thinks it should be doing over the last command I ordered it to do. I’ll grant that the total time spent completing all requested operations is probably better under Chrome’s “optimization”, but it’s not how I want my browser to behave.