I usually use DuckDuckGo.com, because they have a neat toolbar and I want to support their cause, but everytime I don't get the results I want through DDG (which happens rarely) I just type !sp + searchterm into my search bar and it searches via startpage.com, which uses googles search results without my IP address or searches being recorded, no identifying or tracking cookies are used and SSL encryption is set by default.

Startpage.com was launched in 2009 by ixquick to create the same service via a URL that is both easier to remember and spell.