I really want to try the q-Jays and haven't, so take this with a little grain of salt, but... I've used (and loved) the Ety ER-4P with my iPods, I've used the Shure SE310 (which I really liked, and which pushed my beloved Etys back to amp-only duty), and I tried the LiveWires. None are as good with an iPod as the Atrio M5, in my experience. I am very much not a basshead -- the Atrios are too much for me with Shure olives or Complys or the FutureSonic or Ety bi/tri-flanges. But with FutureSonic or Etymotic foamies, the Atrios have really nice articulation and detail, very well controlled and extensive bass, and they just have this undefinable punch. The Shures have a sweeter midrange, but compared to the Etys and Atrios, they still have a bit of a high end rolloff, and the Atrio bass is tighter and goes lower than the Shures. The Etys are awesome for classical and when I feel analytical, or when I hook up to my Go-Vibe 6 (using the P->S adapter cable), but the low end recession does put me off a little, especially compared to my Atrios.
The LiveWires are just unlistenable for me with my iPod. They're too sensitive, the hiss drives me nuts, especially because I tend to listen to my music with the volume fairly low. EarPeace says they're working on a solution, but they haven't gotten back to me on it yet. I tried using my P->S adapter with them, and the sound just wasn't good -- it felt just a bit too lean.
So in short -- if you like analytical, the Etys win. If you like detail but still want some punch and, honestly, a bit of a fun sound (I think that's the first time I've ever really realized what fellow audio geeks meant by that term), go with the Atrios. If you're big on the midrange and want a bit more of a warm approach, the Shures will be good for you. I would not recommend the LiveWires for unamped use from an iPod.
Oh, and don't forget to let the Atrios burn in -- they mellowed out a lot over the first month that I had them, and turned into very tasty phones. My initial response was that the bass was just too strong, but changing to the foamies and doing a bunch of tone and pink noise burnin helped a lot.