Mark, you don't need more watts, unless you notice a lack of low-end at your typical listening level. That's a sweet amp that produces high current which is what you really want in your system.
The only addition I would recommend is power conditioning/surge protection. You'll get lots of recommendations here, so you should state your budget. Only sources should go into a conditioner, since most are current-limiting. That means a high-current amp like yours can lose dynamics due to the filtering used to lower RFI/EMI and noise from the mains. The result of power conditioning is a lower noise-floor which will reveal more detail, better imaging, and air around instruments.
Anyway, a Pass Labs amp does not need a PC, it is designed to reject common noise.
The only addition I would recommend is power conditioning/surge protection. You'll get lots of recommendations here, so you should state your budget. Only sources should go into a conditioner, since most are current-limiting. That means a high-current amp like yours can lose dynamics due to the filtering used to lower RFI/EMI and noise from the mains. The result of power conditioning is a lower noise-floor which will reveal more detail, better imaging, and air around instruments.
Anyway, a Pass Labs amp does not need a PC, it is designed to reject common noise.