While I like the Complys tips a lot, I have settled on the Shure E2c black silicone tips for their ease in inserting them quickly one handed without having to roll the foam tips in my fingers. And, the isolation is better than stock tips too. With these or the Complys the sound is just unbelievable from a $49 IEM, and I really can't think of a single IEM that I have heard under $150 that can top this. And, they do this without needing an amp to sound good with the iPhone or 3G Nano or even the 2G Nano.
Also, as a lark I thought I would try the NE-7M through my son's Fiio while the Fiio burns in. I have discovered the NE-7M 4 conductor plug cannot be used directly into a Fiio amp without having it sound like artificial reverb and echo was added to the music. This is fixed if I use an earphone extension cord (like the one I have left over from my SE530) between the Fiio and the NE-7M. I don't know why anyone would want to use a Fiio with these, as the Fiio is a hissy $8 line booster that should only be used on hard to drive headphones or earphones (like IM716, AKG 240M, Yamaha orthos). None of my other portable amps does this echo thing, just the Fiio. Just didn't want people to think something was wrong, and remind people the NE-7M do scale up in performance with a good amp on the line out dock due to the cleaner signal. But there is no reason to use the Fiio line booster on the headphone out jack of your iPod when you are using NE-7M.