Win7 pro, firefox, msse, ccleaner, and malware bytes round out my usual list.
I used avg before and never had an issue but decided to try msse and it has been ok really. I tried opera 10 and was not impressed with the interface. It worked ok but I just didnt like using it. I do not care for safari on win or mac.
I am not sure I trust google enough to use their browser. I am not sure I want them knowing more about my browsing habits than they already do. Maybe it is paranoia.