DuckDuckGo isn't much better than Google; both of them hijack your links. This gives an opportunity to track what you click on. If you watch carefully your links go to "r.duckduckgo.com" -- this page also doesn't use SSL. For example:
http://r.duckduckgo.com/l/?kh=-1&uddg=https%3A%2F%2Fen.wikip...
StartPage doesn't hijack links, it (optionally) uses POST and you never send a referer header so traffic looks organic.