Reply to producing on headphones (any Audio Technica ATH M50 owners?)

I've been producing for around a year now, and I need some good gear to produce on (audio-wise), and since I don't have an acoustically treated room, I figure headphones are the best route.

I have looked around at various different pairs and obviously require a flat frequency response so that I can hear the different freqs and sounds accurately.

Everywhere has recommended the Audio Technica ATH M50s for production and mixing, does anyone have any experience with these, and have they helped your productions?

For the record, I will be purchasing M-Audio BX8 monitors for DJing, so they would provide a second form of reference, after mixing has been completed on my headphones..

whaddayabelieve?