Because of this thread I installed Firefox and Chrome. Chrome seems like the fastest, but has the least options. I guess I'd have to just spend a lot of time with one to get used to it, but neither has all the options I like in Opera.
Neither has most recently used CTRL-Tabbing (tab to my MRU tab, not the first in the list), and neither has mouse gestures. I found a Chrome Extension for mouse gestures, but it apparently only works on some types of sites for security reasons. Also this is nitpicking, but neither has the cool panel flyout that Opera has.