I've had DuckDuckGo set as my default search for awhile (before that it was Bing, now it's IxQuick/Startpage); Blekko is on the list to try. They all have their good points and things they do better than Google, but when it comes to simply finding webpages, Google still usually gets more & better results; so when I can't find something with my default, I still turn to Google (and usually find it.)

Opera makes it really easy to create a list of pages-to-search-which that you can use really easily - my current list of commonly-used searches is Ixquick, Google, DuckDuckGo, Bing, Blekko, Wikipedia, Pinboard, Delicious, Youtube, Twitter, Fanlore, AO3, LibraryThing, DeviantArt, Google Images, Google nGram, Archive.org, the Wayback Machine, and IMDB. :D