I've briefly heard the iTube and the Motion 4s (although not together), and both seem to be pretty good for the money. Make sure all your songs on your iPhone are stored using lossless compression (i.e., do NOT use MP3).
Down the road, you might want to consider bypassing the iPhone's crappy DAC using something like the Wadia 170 iTransport and an extrenal DAC. Yoiu'll get MUCH better sound quality.
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