anotherthing - If bandwidth isn't an issue, why not download all three and try each of them for a week? Since they are free, they will not take much from you than a few minutes on broadband.
Personally, I'm a Firefox fan. 3.5 is very good, I upgraded just last week. And the add-ons available for it (especially one, which I won't mention on this forum
) make it truly worthwhile.
That said, I suspect Chrome is marginally faster. But I dislike Chrome's interface and its lack of handy controls.
Not used Opera for years now, and since Opera's shortcuts are slightly different from IE/Firefox/Chrome, I don't think I'll go back.