I recommend Bing.
The thing that you almost forget after using Google forever is that they can always pull up relevant links to what you want, even from ancient forum posts if it's a really esoteric issue that only 5 people have ever had.
DuckDuckGo is decent, but it's no where near Google in that capability. Blekko not even close to DDG. (I have been using Blekko for my default search engine for a week or two now, but I almost always have to revert back to Google, except for really obvious results that I could probably pull up without a search engine entirely. I feel bad saying it, but it really isn't that good. Hopefully they keep working on it, though. )
Bing, on the other hand, was almost neck and neck with Google; it was only very occasionally that I would revert back to Google, and I used Bing for perhaps a month. I theorize that this is because Bing has millions (billions?) of Microsoft dollars behind it, way more than any other competing search engine.
I think I'm going to go back to DDG for a bit. I only used it a few months ago; I'm interested to see if it's gotten better.