I just started the Kagi trial this morning, so far I'm impressed how accurate and fast it is. Do you find 300 searches is enough or do you pay for unlimited?
I do think it's worth the money however, especially since it allows you to cutomize your search results by white-/blacklisting sites and making certain sites rank higher or lower based on your direct feedback.
Plus, I like their approach to openness and considerations on how to improve searching without bogging down the standard search.