karotto

What Is The Best External Sound Interface?

Hi there,
I have much music stored in uncompressed format on my computer. I woudl like to buy an interface that takes this digital data and converts it the best way to analog and then hooks up to my (state of the art) amp. I only need it for playback and not recording and obviously I only need 2 channels. I want the best, most pristine sounding device that gives me the best D/A conversion that technology currently has to offer. What device should I get? I was looking at the Edirol UA-1EX but they don't even list the signal to noise ratio or dynamic range. I have spent much time and I find it very hard to find reviews of audio interfaces of such sort. I have a laptop so only Firewire or USB2 are an option. Any suggestions are very, very much appreciated. Thank you.