The m50s are really marketed for studio use from what their specs read.. That said, if you're looking for actual studio headphones, check out a pair of Beyer 770's and look no further.
My guess is you won't like studio headphones based on the music you listen to. They're meant to be as neutrally flat calibrated as possible (similar to a pair of studio monitors.)
I have no idea about those V-Modas... They don't even advertise their technical specs that well -- I had to dig just to find their sensitivity/response values.
The good thing about rap/techo/electronic/etc is that those genres typically require inexpensive (uncomplicated engineering) to properly hear what they want you to. These would technically rock your needs.
I bought a few of these just for general use and to travel with just so that I wouldn't care if a $20 pair broke.