Personally, I think that IE has always had a lot of problems and errors that make browsing the net a big headache. I have gone with Opera myself even though the banners are kind of annoying it is still way better than IE. Firefox has recently become a popular browser, however it has very serious flaws. If you are using firefox or you are thinking about it you should read this article published recently about Firefox security flaws.
It seems that firefox and mozilla could allow malicious code to be executed in your machine. That is just too big of a risk, even bigger than those security problems that IE was facing recently. Therefore, you should wait a little while before surfing with firefox or the sharks are going to get you.