Opera for me!The only annoyance I've had is since I recently started using IMAP in Opera Mail. It keeps crashing sometimes when I exit Opera, and then prompts to send an error report. I've read that it is a standards-compliant web browser and yet some sites don't render nicely (blame IE?). So Firefox is a backup.But overall, I've found Opera to be the most superior browser in terms of features (out of the box), options to customize to your needs, and SPEED!