What sound card would you recommend for a Wadia 830 with a digital input? I only care about the spdif quality- bit perfect. For those who don't know what a Wadia is, they are upsampling home audio cd players that aren't too cheap; I'd like a good card. I can't decide between these...

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No, I don't have HD-600's yet. I'm thinking they are the best bet though if I can power them adequately with the bithead...

I asked the tech guy at headroom if the total bithead will power seinheiser hd-600's adequately. He said no, but if I gave it 9-10 volts instead of 5, it will be adequate. The IC or transistor apparently takes up to 12 volts, and performs better closer to it for heavier loads. I'm wondering...