What is the best dynamic driver IEM with a neutral sound sig that is well extended on both ends that is under $100? What about best under $50?
 
Also has to be higher than 16 ohm impedance and somewhat sensitive, to be used with just a Samsung Galaxy S4 smartphone. No mic or controls needed either. Don't want to use any EQ either. 
 
I was thinking Brainwavz M1, but I hear they lack top end extension and sparkle, which is something I like a good amount of.

I have the micro driver Vsonic VC02 which I like a great deal - their impedance is higher than 16ohms, and they aren't all that sensitive. They go for under $50 including shipping from Lendmeurears - and they ship from the US so you would get them pretty quickly. Altogether a great sounding pair of headphones. Detachable cable too - maybe too detachable -lol. Take a look at Joker's review of them - I echo most of his impressions - great clarity - bright high end and really punchy bass if you get a proper seal. Take a look.

If you can still find one (crazy deals at the moment...), get some PFE 012/022/112/122. Not the best look/build, but the sound is pretty amazing in my opinion.

My GR01 is a balanced armature, and so are the PFE's. I am looking for a dynamic driver. Just to mix things up. also something no to expensive just to throw around and not have to be to careful with.
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rem0o said:

If you can still find one (crazy deals at the moment...), get some PFE 012/022/112/122. Not the best look/build, but the sound is pretty amazing in my opinion.

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Oh sorry mate. Didn't see that detail...

The RE0, RE_ZERO are amazing sounding for the price and they are very detailed, neutral and cover well the both end of the frequency spectrum. The other IEMs like Philips S1, S2 are also great buy.

RE400 easily.

RE-400 is fantastic, but somewhat on the warm side of neutral. Maybe you should try Etymotic MC3/5, which are probably the most neutral dynamic driver IEM you can buy.