I like Opera's look and feel, esp in the new beta 8 version, however things don't display properly for me in a few of the sites I go to, like one of the highly secure sites for my university where we check grades. Opera also doesn't like gmail much either, as some things get improperly displayed there too. It feels fast though, and very smooth.
Overall, I think I'll stick with firefox though, it's free, and it does everything I need perfectly. My only gripe with it is minor, it's the only browser that seems to not display the proper width of a text box on an old version of the vbulliten forums (used at HowardForums) so whenever I post something I have to deal with the thin text box, but since that's it's only shortcoming for me, I'm sticking with it, I had a lot more gripes with internet explorer.