I use Wera Premium plus with diamond embedded in the tip and never have had problems removing Phillips. Of course if they have already been stripped out before. If thats the case, I have to resort to plan "B"

I used to pick the Wera tools up in Germany, but I think they can be ordered in the US online now.

http://www-us.wera.de/diamantbeschichtete_bits0.html?&L=1&tx_codetopx_pi1[tooltip]=1&cHash=1df5645a085b878c618224b0dd5df871