Have you also considered comfort from an on-ear vs. over-ear perspective. Keep in mind. the AT ATH-M50 is an on-ear variety. I know when it comes to my preference, I have little tolerance with the on-ear models because my ears tend to tire of them easily due to the pressure they apply on the ear. Having the pad go around the ear, can mean for longer listening sessions.
To the individual who is considering the K167, I had a pair for about a week. The pads softened up too quick and by the end of the week, my ears were literally resting on the actual speaker baffle. I tried some small pieces of foam to push out the ear cushions a bit, but then the bass response really died off quick. About 2 months later, I ran into a pair of the K67, so I picked them up. Again, with that pair, having the on-ear fit, finally was the deciding factor for me that I'd never purchase another pair of on-ear headphones due to comfort issues. It just isn't worth it from a comfort point of view. Your views might be different, but I thought I'd toss out some observations to include in your analysis.
Best of luck !