I've just been through this with some IEMs. I settled on the Etymotics 6i. They run about $80. Isolation is incredible; I was in the living room while my wife was watching Bones (probably at ~70-80dB) and I put on the Etys. I could barely hear that the TV was on, and that was without anything playing. So the downside there is that you won't be able to hear anyone--at all.

Skip the $90 Grado iGis.

I am the Doctor, and THIS... is my SPOON!