Hey!
Skip the iFi Power Station... it is just a line filter not a regenerator like the PS Audio. So, plug everything into the PS Audio.
Just make sure you don't exceed the PS Audio's power, I'd leave some headroom maybe a third or so. Your amp at 225wpc is pretty big make sure you check that won't over load the PS Audio, otherwise you might have to plug it directly to the wall.
I have the original P600 and I power my whole system with it, I have smaller SET amps so they don't pull too much power. Normally I never use more than 300 watts from the P600, so a lot of headroom left.