Sound Card / Inteface With Audiophile Quality Dacs, Is there one? Options

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Hi everyone,

I'm looking to buy the best soundcard or audio inteface on the market. The idea is to use that and my powerbook in place of a true audiophile CD player, like a Krell or Musical Fidelity. I'll be hooking the card/interface into a Rogue Audio tube preamp. I'm talking hard-core here. I'd be very glad to buy an entire audio interface, with mic preamps etc, if it meant that audiophile sound would come out of my laptop! I'm also a recording artist, so I could use something like that anyway. Any thoughts?

Also, is there any way to play SACD or DVD-A through a computer, using some sort of interface?
Thanks,
Oliver