There is a conflict of long term power dissipation and effectiveness. Take for instance the use of a PTC, in the long term is could dissipate, say .5 W BUT if the incoming mains dips, as the PTC is "hot" it will not reduce the inrush current when the mains returns. Another way is to use a resistor in series with the mains which is shorted out by a relay, again 2W (or more) dissipation but it will need a driving circuit. A way I fancy is to use a resistor in series with the earth return of the resevoir capacitor, this reduces the inrush current and use a FET to short it out after a delay. Needs control circuitry AND could have an effect on the ripple output of the PSU but should use less then 10 mW.
Frank