I wanted to know what a good sub-$300 setup (including interconnects!) would be for the iPhone 4S, so I figured I'd ask here.
I'd prefer if I could use my SE215's too, because I really like the way the sound.
If you want an IEM, the RE-400 seem like a great choice. Quick, easy and most importantly sounds good.
If you're looking for an on-ear, the Momentum On-Ear, Amperior and the V-Moda M80 seem like good choices as well.
If you want an over-ear that is still portable, try out the V-Moda M100 or the Momentum.
Hope this helped.