I have the most expensive of the microdrivers(I think?), the Sennheiser IE800.
Makes the EPH-100 sound straight up fake.
If you should try another microdriver try out the JVC FXD70. IMO better sounding than FXD80 and EPH-100. The cable and strain reliefs are also much better on the FXDs.
There are some inconsistencies regarding the FXDs though that's a bit worrying. I have had 3 pair from the FXD line and no one have had driver flex or driver failure, but I heard about imbalances and some being more strident than others and so on.
FXD70 in IMO the best bargain all of audio if you listen to synth, new wave, metal, some pop, classical, rock and perhaps some fast electronic music.With a bit of EQ and crossfeed they can sound absolutely glorious.
You need to get these cheap foamtips to get the best out of them, both sonically and comfort.
TDK IE800 is a double microdriver, Fostex TE-05(?) Aurisonics Rockets.