Actually, of all the browsers i've used (IE 6,IE 7, Firefox, Opera). I feel that Opera is the best, and this is of several reasons. The main one I think is that it is extremely fast, but not as fast as chrome. However, it is the pheriphals from Opera that I feel it makes it the best browser.
Firstly, Opera has its own built in chat client, which means that there is no need to install any other addons for chatting, like in Firefox. Secondly, Opera also has a built in download acclerator, as well as its own torrent client, which again, means that there will be no need for any addons.