All the comments on the HD 7/8 are very promising indeed. I like the M-100, but I've always felt that more bass on them would always be welcome. From a music listener's perspective, these would definitely be one of the better headphones for my tastes.
The HD 8 DJ is especially interesting. It's a shame about the price - this is in HDJ-2000 territory, and those are quite expensive. Hopefully the prices on these cans will go down, but I'm doubtful.
Unless your using the high quality rane's or one of the new bespoke rotary mixers like I do you will probably never have a mixer that does high-end $300 dj headphones justice sound quality wise. Even the expensive pioneers and Xone's sound like crap out of there headphone outs and I'm talking 1-2k mixers.
My cans sound great out of a DJM-750, and there are even higher level offerings from Pioneer, let alone other brands. I don't have a problem mixing with them, as I find sound quality to be more than acceptable, pleasant even.