Mozilla all the way baby!
Why?
Features, customizability, email client, w3c compliant, includes Math font for mathematical-oriented webpages.
The prefs.js file is just a text file that you can edit in BBEdit to add features I frequently find on Slashdot. Commands that I've added prevent a website from seeing the previous website I visited via a link (handy for clicking on New York Times links on Slashdot to read articles).
Cookie Manager allows for selective blocking of cookies from specified websites. Cookies can be viewed and deleted at will. Cookies can have a user specified life time.
Forms Manager can remember data I fill into forms, like my address for online shopping.
Image Manager can selectively block images from specified websites/servers.
Password Manager for websites.
My current setup blocks all popup windows and prevents a webpage from moving or resizing windows. New windows open up only if I request them via a link. I finally removed Macromedia Flash player from Mac OS X "System" folder, thus preventing animated advertisements from ALL websites. Selective image blocking from any specified website/server. When the "Back" button is clicked Mozilla is set to read the cache rather than reload the website (handy again for preventing advertisements from loading in). Webpages are forbidden to auto-reload after a specified time, again preventing advertisements to load in.
When your internet connection is 26600 bps, you have to go to extreme measures to see content, i.e. text, in a reasonable amount of time.
I get to the information I want without having to read or wait for all the junk to load in.