[Mondial]

Jon, a little clarification about caps in general. DC current does not pass through a capacitor unless it is bad (leaky). A capacitor will have a DC  voltage applied across it, but aside from the initial current needed to charge the cap, no further DC current will flow.

In the case of  high capacitance ceramic caps, the effective capacitance is a function of both voltage applied and temperature, The capacitance may change a few percent as the applied voltage is increased, but it really won't make much of a difference when used as a bypass.

What sort of caps are you planning to use for the power supply filters? Mylar or polypropylene film would be recommended, as modern small capacitance electrolytics won't hold up in this application.