Is Opus applicable here or don't I need it? (kind of want the controller functionality of it, though).

In case this info is needed: AC input = 100-240v, 1.5A, 50-60Hz
PC is 2.4G Celeron, 512MB RAM, 40GB 2.5" drive, onboard sound and video, probably 6 USB devices (looking at powered hub).

Yes, I'm clueless when it comes to power - but I'm learning a lot from you all and almost have enough info to proceed!