I use the AT M50 & they’re pretty good, don’t go as low as I’d like but comfortable & do the job. Beware buying on the net tho, if the price seams cheap they’ll be forgeries, a mate got stung a few months back.

Best I’ve heard are the Grados, tiB had some I tried & they were bloody marvelous!!!

http://eu.audio-technica.com/en/products/product.asp?catID=5&subID=39&prodID=266

http://www.grado.co.uk/headphones.htm

Re IEM I use these but I get a serious discount due to artist rates/endorsement, they’d be way too expensive normally.
8 drivers a side, sound wicked!!!

http://www.jhaudio.com/product/jh16-pro-custom-ear-monitor