I second boRg on Safari. If you're "lucky" enough to get it installed, you'll be met with a clumsy, difficult to read, slimmed-down excuse for a browser. I only use it to render web sites the way they'd be seen on a Mac. Certainly, not good enough for day to day use.
Opera is a good alternative, but it is the only browser that costs $$$. IE7 is the winner in my book. Even Firefox was quick to adopt some of IE7's tabbed browsing features (close button on each tab).
Deleting cookies was a weekly problem for me on IE6. Now, I only have had to do it once on IE7 this year. Only because of the forum upgrade, I think a cookie crumb was left behind from v8.