Assuming that this doesn't turn into a "to condition or not to condition" debate/discussion,
I would think that the preamp should get plugged into the power conditioner.
As far as the amps, there seems to be a variance of opinion as to whether a power conditioner actually helps or degrades versus to plugging them straight into the wall. I guess I'd say experiment with them. Probably the same with the sub.
I would think that the DAC should get the power conditioner treatment,
but I was also thinking I remember reading posts (on this site) to the effect that digital could introduce noise into a circuit, and if there was a case to be made for isolating a component (with a dedicated circuit, for example) it would be the digital stuff. I started to do a google on that puritan, but I got bogged down. Does it have outlets that are desigbated as being isolated for digital?