I have a pair of ATH-M50's. When ordering you have to be aware that they come in straight and coiled cabled versions, so you have to think about which version is going to suit your recording/mixing setup. I chose the coiled ones because I never need to put any distance between me and my DAW.
They are excellent cans for mixing. The bass response is excellent and they expose lower frequency mud very quickly. That said, for tracking and general purpose listening, I prefer the sound of my Grado SR80i's. They have such a clear, open sound. Music is a pleasure to listen to on them. However, if I try to mix with them I always end up exaggerating the lows. Which is why I switch to the ATH-M50's for that. I don't think you can get better mixing cans for the money.
I'm one of those people who does all of their mixing on cans, with some occasional checking on a pair of crappy Bose computer speakers. My building is not well insulated sound wise and I'd be evicted pretty damn quickly if I set up a pair of monitors and started auditioning synth presets on them. Besides, I am not able to acoustically treat my space and so if I spend a bunch of money on some expensive monitors they'd just be wasted.
I also use a VRM Box for mixing - I don't think the speaker simulations are particularly realistic (you're not going to forget you have cans on) but they are very useful for running your mix through a bunch of different perspectives to check for problems. I think people buy the VRM Box thinking it's going to be something it's not, and then they're disappointed. It's not meant as a substitute for real monitors, it's just there to give you some alternative frequency curves in order to get your mix sounding acceptable on as many speakers as possible. I just wish they had a car simulation.