I currently have been using duckduckgo, and have used the other 2 you mentioned.
The last time I looked Ixquick was based in DC. That made me suspicious.
My local ISP has partnered with Google and I think they manage the local DNS server. If google owns the data I am not sure that the search engine I use makes any difference.
Btw, startpage.com is based in one of the northern European countries, IIRC. What makes me curious about them, is both ixquicksearch and startpage have the exact same page layouts, and when one is down, so is the other. What does that tell you?