You seem to get attracted by those super high margin products, that both the PS Audio and STR preamp appear to be but at least the STR pairs have great audio specs. I have no idea how Anthem can justify their selling price for that preamp, but I do understand as long as there are people willing to pay for it, that's all there is to it then.
I am just a practical minded person (who tend to put more emphasis on specs and measurements), at least that's what I think I am.. Other than that, you can't go wrong with the STR anyway. PS Audio direct stream dac is a different story, but obviously you like it so that's good.