The original Decco has a Scott Nixon designed NOS DAC which is different from the Nova, new Decco and iDecco which has the ESS Sabre 9006 which can accept up to 24/96 through SPDIF inputs.
I've owned both the decco and Nova at different times. The Nova has more inputs and can accept up to 24/96 material. I didn't notice much difference in the amps in each unit despite the power ratings.
The Nova was more more versatile with the extra inputs and preouts, but both sounded good. IF you don't have any 24/96 material than the Decco might be all you need.
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