Mac Mini configuration

I suspect this has been addressed; if so I'd appreciate a link. This will be my initial step into computer audio.

I have a Mac Mini running Mountain Lion (OS 10.8), Musical Fidelity USB-S/PDIF converter, and Pure Music. A couple of questions: Should the output of the USB-S/DIF go to my Oppo BDP-95 or directly to my Cary Cinema 11a processor? I think the Oppo has 32 bit DACs, the Cary 24 bit DACs, both likely 192 kHz. How much, if any, of the application software that came with the Mini should I strip out? At some point the USB-S/DIF will be upgraded, but at $100 it seemed good value for a beginner.

The rest of the music system is Proceed Amp2 and 3, KEF R107/2s with KUBE, KEF R102 centers and surrounds with KUBEs.

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