Juanin, I guess what you are looking for is a Music Streamer, with an integrated DAC on it. Google under Logitech Touch as an example.
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Look no further then the New P S Audio Nu Wave dac.
It retail for $1k but underwood Wally sell it for $699
It is a outstanding dac uses very good Burr Brown dac, and does not use Any op amps just discreet components. Will compete with any thing out there up to $2k ,the. nad M-51 is the only think that betters it at $2k.