Liked, followed, replied, and waiting. :D Edit: submitted prematurely.

Shure SE215 is the best I can recommend in your price range.

It all depends on what sound signature you're looking for as well as what amp you have.

Either the Superlux (only one I've tried that you've listed) or up your budget a bit for the Creative Aurvana Live.

Why would you consider the HD650 over the HD600?

You could spend the $100 on custom tips for your Etymotic IEM. Otherwise I'd have to agree with roguegeek.

Not that I've tried.

Sure thing.

The only two under $300 that I can recommend are the Shure SE425 and the Yamaha EPH-100.

V-moda M-100 or Mrspeakers Mad Dogs with Schiit Magni.

Very, I enjoyed the stock bi-flange tips but if you don't like them I recommend the T-400 series comply foam tips.

The second generation Creative Aurvana Live. (slightly outside of your budget)

I prefer the Shure SE425 but it's slightly over your budget, only thing I can think of is the Klipsch x10i or x11i.

Best sound goes to the EPH-100, more accurate sound and bass goes to the EPH-100, noise isolation: Shure SE215>Yamaha EPH-100>Bose Mie2i.

Slightly above your budget but the Creative Aurvana Live are lighter, comfortable, and balanced with a pretty good soundstage.

Sennheiser HD558 is a great option in your price range or you could consider the Audio-Technica ATH-AD700x (although I've only tried the ATH-A700x).

I loved my Mad Dogs but the allure of the Alpha Dogs was too much, I highly recommend either of these.

The SE215 has superior noise isolation bit the isolation on the EPH-100 is pretty good. If you want bass + mids I'd go for the SE215 but if you want a superior soundstage and a balanced sound I'd go for the EPH-100.

The majority of the time.

+1 to Etymotic HFx or Hifiman RE-400. I've owned all three IEMs and strongly recommend the HFx or RE-400 over the SE215, especially if they're for studio work.

I haven't heard Fischer Audio, which do you find ugly, the Hifiman or the Etymotic?

I would get rid of the S4i and CX400 from your list as they're lacking in both the mids and the highs, I haven't heard the Beyerdynamics you listed. At the limit of your budget I'd recommend the Etymotic HFx or Hifiman RE-400 and you will not go wrong with either one; at a lower price point I...

+1 to Shure SE215, I used them while at the gym and while on jogs and occasionally while I slept. They're a bit bassy but the bass doesn't muddy the mids or treble, the treble is a bit rolled off but not too much.

Sounds good! Guess I'll try for a Nexus 5 around December.

Sounds good, I'll be comparing them to the Shure SE215 and maybe the Klipsch X10i/X11i.