Google is always a safe bet for most search queries, and most of the time your search will be successful on the very first page of search results. Yahoo is also a great choice, and finds a lot of stuff that Google does not necessarily pick up.
I've heard Duckduckgo mentioned a few times today so I looked them up; it doesn't look particularly revolutionary. Bing have also been caught using the Google engine recently, that leads me to believe that Google is the best search engine.
Google is always a safe bet for most research and most of the time your search will be successful on the first page of search results. Yahoo is also a good choice, and finds many things that Google does not necessarily seek.
but do you guys bother searching on other engines like Bing if you find that you can't find what you want on Google?