Chrome feels the fastest to me, although the latest versions of Chrome, Firefox, IE, and even Opera all feel about the same. IE9 is a very good browser, and a must really for all IE users on Vista or Windows 7. After that, if you do prefer a different browser, you can't really go wrong with Chrome, FF, or Opera - but you'd likely be doing so for things like add-on support or portability. Speed above another choice would not be something you'd really be getting if using one of those 4, which is actually quite a nice change to the way things were about 5-6 years ago in the browser space.