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Both Firefox and Opera have better features for heavy internet users, whereas IE is built in to Windows and is important to check for compatibility when building sites.
I would recommend using the other one at least one day a week for your browsing.
Why is that? I can understand testing in all major (and some not-so-major) browsers, but why would you use your non-preferred browser just for normal use? (This isn't a sarcastic question, by the way. I'm sure you have a reason for that statement and I'd be interested to know what it is.)
And I recommend doing something like that simply because it gives you a better real world experience as to how the browsers differ in rendering sites. If you only use a different browser just to see how a specific page or site looks, you may be missing some great examples of "how to do" and "how not to do" things.
Much of the same can be said for Opera but I had a problem with a few sites with it. I don't experiment much with other browsers but Netscape is good as is Safari and Lynx :) .