Mics don't really mean a mess of wires and if you want to be low-profile, then that's actually harder to do with internals because...you're going to be holding the thing. You can't just leave it in a pocket because the mics will end up rubbing against some fabric. What did you do with the cell, just hold it up? Arm strain alert.
The PCM-M10 internal mics are good but I don't know if they can take EDM bass without overloading--probably not. They do roll off the bass around 60 or 80 Hz (I forget) so you also lose low notes.
A great starter mic--esp. if you need it in less than a few weeks--is the Soundprofessionals BMC-2. (Chris Church builds his by himself and he can take some time.)
http://www.soundprofessionals.com/cgi-bin/gold/item/SP-BMC-2These are literally the size of pencil erasers and they have very thin wires, very stealthy with a dark shirt, hat, whatever. If you're going to be using them a lot, get the 3 year warranty. They're tiny and you don't want to jerk them by either mic or plug, but they are surprisingly durable.
Get the BMC-2 with clips, clip it to a shirt collar or a hat or glasses--creativity--at the width of your ears. Welcome to binaural recording and you're the mic stand. You can hide the mics inside your shirt on the way in, or coil them in a pocket--looks like earbuds.
Run the wire inside your shirt down and over your belt loops to the PCM-M10 which is conveniently lurking in a Lowepro Ridge30 on your belt. It's like it was made for the PCM-M10--the flat PCM-M10 remote goes in the zipper flap on the front, there's a little pocket under the flap for a battery box and the unit goes in the pouch itself. Camera stores, Worst Buy, Amazon all have them.
http://www.amazon.com/Lowepro-Ridge-Camera-Case-Arctic/dp/B0009VT9OI/ref=sr_1_2?s=electronics&ie=UTF8&qid=1388360218&sr=1-2&keywords=ridge+30+loweproYou don't need a preamp for EDM--it's amped enough and you'll save a lot of $$. You do need a battery box, because it sends power to the mics that help them accept louder music. Get one of the cute small 12V ones at Soundpros, with the cable unless you have a short right-angle M-to-M cable at home (less stress on the jack on the PCM-M10 than a straight plug).
Mics-->battery box-->Line-in (not Mic-in--the battery box gives you a signal just strong enough for Line-in). Try around 4 on the level dial for starters. MANUAL LEVEL (switch on the back of the PCM-M10). Put on the Limiter in the PCM-M10 menus in case the bass drops louder than you expect--it drops the level if there's a sudden boom, otherwise does nothing. Set and forget.
I used this setup for years. Basically the mics hear what you hear. CA-14 is a step up for depth and richness, but if you need a quick starter kit you will be overjoyed with those.
This is much stealthier than a Zoom with its mics hanging out there so obviously. The PCM-M10's mics are recessed, and most security guys think it's a point-and-shoot camera. They're looking for knives and guns anyway. Don't bring those--they have lousy fidelity.
Seriously, that's your starter kit, and then you can wave your hands in the air like you just don't care.