I would love that IEMs as well. Unfortunately I haven't found it yet.
Regarding recabling, this seems like it might be an ideal option for the 272 assuming it's possible to get into those shells: http://www.head-fi.org/t/601360/universals-modded-with-removable-cables-fischer-audio-dba-02-brainwavz-b2-um3x-sleek-audio
$300 doesn't open up that many possibilities compared to $200. I still think I'd go for the GR07 in that price range. Might as well shoot for $400 and get a mid-level custom like the Alclair Reference for a bigger step up from the FXD80.
It really depends on how you like to hear your music. I think the general assumption is that a somewhat v-shaped signature (or at the very least some enhanced bass) would work better for electronic music but that may not be true for everyone. Personally I think that this is more true in reverse - sometimes a not-too-great earphone with a v-shaped signature tends to sound better with EDM than other genres (saw this recently with the JVC FX101, JVC FX40, and even JVC FXD80).
I certainly wouldn't go for the RE272 or Westone 2 unless you already know that a balanced sound is what you're after. The TF10 and Coppers are safer choices. I don't recommend the Copper very often these days because I feel that there are some better values out there - the VSonic GR07, JVC FXT90, and Yamaha EPH-100, for example. I don't know what your price limit is but if you're looking at the coppers I am sure you can afford the FXT90 or EPH-100, which are slightly better performers in my book and provide plentiful bass. The TF10 is also a good choice if you're not paying more than $150-200 and think you will be able to get along with its fit. I would still go for the JVCs or Yamahas, personally.
Thanks for the recommendations! I really like the Yamaha's and am looking to buy them, but because I live in Canada it is extremely difficult. I haven't been able to find anybody who is selling new ones in Canada, including Yamaha! If anyone has any suggestions on where to look I'd really appreciate it. Thanks!