Hi. I have the MOHR too. In my system, I can not hear any diffrence between the stock cord and my APC power cord & PS audio microlab. But I think it just shows how good headroom's powersupply to the MOHR is, rather than power cords not making a difference. With my Philips 963sa, I can differentiate the change powercords.
As to your next question, I think it would be better to plug it straight into the wall if your powerstrip has no filtering & surge protection. I cant see any added benefits if its just a powerstrip other than if you need an extra otlet for your other components.
edit: mines not the MOHR, just an MOH with premium modules.