From looking at all your components I think the Belkin PF60 is more than enough to handle them as is. Nothing in your list of components really calls for a lot of electricity from the socket. I wouldn't change anything to be honest. What do you feel is missing from the sound of your system in its current state? What is your budget for a power conditioner? How about changing the wall outlet to a Porter Port outlet and then plugging the Bryston amp directly into it. Then you would plug in the Belkin in the same outlet but only having the sources and preamp plugged into PF60.
Your amp would have all the power it needs with the added benefit of the Porter Port. Your front end gets the benefits of the PF60.
Your amp would have all the power it needs with the added benefit of the Porter Port. Your front end gets the benefits of the PF60.