Or, even better, dump both and set up keyword searches for Google and all the other sites you frequently search on. I have Google's keyword set to "g" so if I want to search for widgets, I can just type "<Ctrl-L>g widgets<Enter>" from any browser window. Or change the <Ctrl-L> to a <Ctrl-T> to open a new tab, which doesn't waste bandwidth loading a page I don't need and doesn't steal my focus from the URL bar.

I also frequently use keywords for Wikipedia, IMDB, Youtube, and a bunch more.