I suppose it really depends on what you want a broswer for. I am biased, because I am into web design, but here are my opinions.
IE- Version 5 was relatively fast, didn't include unneccesary features, but horrible at code compliance. Version 6 looks to really improve that, so it could be great.
Netscape- 6 is just really, really bad. I don't love any versions, because of all the extra crap nobody uses, but 6 is worse. However, code compliance in all the later browsers is strict, almost too much. I do prefer the image capabilties over IE.
icab- Only for Mac users, my browser of choice. Fast, compact, and relatively compliant.
Mozilla- The Gecko engine is really, really nice for complance. If you ever use CSS, Mozilla is beatiful. However, most browsers aren't as nice, so it can be misleading.
Opera- Fast, compliant, but I haven't used it much, so I can't make many comments.