I'd try a Benchmark DAC1. Excellent DAC, superb headphone amp. They run $600-650 used. If it's not for you, no problem selling it on.
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Let me get this straight: you just bought a $6,000 amp/DAC combo, and you want to use it to listen to headphones without using the NAD's amp section or DAC? Let's get creative here. Why not get your wife some wireless headphones for watching TV instead : )
If that doesn't work, I'm wondering if there is a mechanism for hooking up phones to the speaker outputs, so at least you are utilizing the NAD's DAC. If I understand this device correctly, it does just that: http://hifiman.us/Products/?pid=104