I use firefox for most of my work. Occasionally I use safari for a few sites which have a problem with Firefox . Mega upload sometime back need you to have megaupload toolbar to download anything . I used to open it with Safari then .
Chrome is nice for pure browsing because it's definately faster than firefox. But firefox has all of my development addons which speed up my programming.
And the reason I wont use Opera is just because it's too memory heavy.. It takes more resources than running Chrome and Firefox at the same time..
So just waiting for chrome to get updated.. then i'll make the full transfer.