Overall I like Opera best for features and speed.
I only use internet explorer for temporary browsing.
I so not use firefox, as I will not be push into firefox becuase everything is pushing it on me (sick of that, it is woarse then the upgrade your IE days etc)
Safari, Opera, and safari and not being pushed on me, so I used them willingly.
Opera is best for remembering password, extras and add ons, integrated email, on ya works best on the netbook (tested it on an Asus EEE PC 701, as well as a newer Atom netbook). On a netboo Opera has less memory usage and cpu usage then IE. Opera doea a good job at cashing tabs for future use, Chrome after a while of reloading tabs forgets the cache so Opera doea a better job.
Also for windows 2000, Opera works best but Opera 8 or 9, as Safari cant install properly as well as Firefox, oviously IE cant be updated.
So I find myself liking Opera a lot, even though I don't mind Chrome (except for its tabs handling)
I would use safari more but it lacks features, so I just use it for temporary broswing.
IF you use Safari, do not install the Safari 5.1 update, it will stop internet access on a lot of installs. I had to remove Apple Support software as well as Safari, and reinstall Safari 5.05 just to get it working again. Becuase of the bead Apple Support Software, internet access was blocked for Safari, Inunes, as well as AppleDevice for the iphone (very high cpu usage)