I am really enjoying Safari as my "default" browser but have encountered problems with surfing some Web sites as I get activity errors and "erroneous" Web page layouts. I'm a former IE user prior to Safari and am looking for a secondary browser as back-up. Anyone care to recommend one? I admire Safari's speed, but want to have another one on hand. Thanks. ps: Not interested in tech-specs.. but more into end-user usability.. Web speed, intuitive interface, good all-around Web browsing experience.