Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I am using 2 (kinda) at the moment.
I was using Chrome for a while but the bugs were annoying the hell outta me. I loved the really clean look and the unibar but the bugs got the better of me so I have swithed to camino as my main browser for the moment. Mainly because I like having favicons in my bookmark bar.
I still default to safari from time to time because it is solid so if i get issues with camino i know i can rely of safari.

Also I have tried both opera and flock and neither appealed to me. Flock was a bit too busy and I just didnt like Opera too much.
 
WebKit nightlies on top of Safari 4 for pretty much everything.

Chrome for everything not included in "pretty much everything."
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.