The E07K would probably be a better bet if you want the best sound quality. However, I'd recommend you just go ahead and buy the E17 because it's only $20 more expensive and it's much better than the E07K.
See, I don't really prefer the E17 that much over the Clip+. Not enough to carry the E17 around instead of the Clip+. That's one consideration. The Clip+ is just uber portable with its small size