Summary: Well, i won't make a long review.
Having the iPod Nano V6, SansaClip+, SansaClip Fuse, iAudio 6 and a mix of older Sony's, iPod's etc ... I think the best sounding player to me was the iAudio 6. Followed by the iAudio J3. The difference is marginally, but somehow the 6 just performed a tiny bit better to my taste.
Pros: Great sound, EQ features and options, portable, battery