MUAAHAHAHAHA! HA! HA!
Thanks for the ER4 page, so much! Mine are currently busted from a bit too much abuse and there's a loose connection in one wire plug assembly. I'd been waiting until I could justify spending the cash to send them in, but now I know there's nothing in there I can cut the puppy open and do my own surgery! Many times I've spent 30 minutes or more fiddling with it to get sound in both ears so I could edit something. Soon fixed!
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For the monitoring, I've got ER4Ps with the P-to-S adaptor from Etymotic, so I pop off the adaptor and can turn them up loud enough to hear what I'm recording, I just can't carefully listen at that volume and I'm certainly not a Chicken of the Spring so I don't really like getting it that loud either.
Noise cancellation... Hmm. Anyone tried over-the-ear active noise canceling headphones just for the isolation over in-ears? One thing I want to be able to do is choose the precise height and orientation of my mics as most of the time I don't have a lot of choices for position in the room.
And since I'm going to do modifications, I think I'm going to try out some sort of shock absorber to minimize the microphonics. (That does bug me about them, but I've found it a small price.)