I mostly use DDG and Startpage. But sometimes Google, when I'm not having much luck. But not via Tor, obviously. And even VPNs can trigger Google's "you look like a bot".

I used to love Metacrawler. And I see that it's back, but just drawing on Google and Yahoo!. Also by InfoSpace, Dogpile, which draws from more sources. But I haven't used either enough to say much.