If you're using a standard XYZ router table you should be fine with the fanuc post, or any standard mill post processor, theres lots to choose from. Its when you get into 6 axis and rotational axes with odd machine kinematics that the post becomes critical, ie) tooling offset, rotational radius in relation to the other axes etc. Again, if you dont have the rotational axes you have a wide variety of post processors to choose from that will all get you consistent results.