I'm actually astonished there isn't a solution for this.
Companies obviously don't realize there's a demand, particularly for DJs and music enthusiasts, the requirement to use the cloud when there are technologies which could easily (for them) be manufactured into amazing products is beyond me. A hard drive with its' own power source, a 2" LCD, navigation buttons and an output jack would be more than enough. I'm sick of not having music with me.
Anyway, rant over. Is the Cowon X7 actualy bad as a product, or is it likely to just have been the single one you bought, bth73?