Your taste in music is similar to mine. Here are my picks, from high to low.:
1. Denon D5000
2. Shure SRH840
3. Beyerdynamics DT770
4. Beyerdynamics DT880
Not so much an M50.
Btw, I've tried all of these
Just some samples of what I listen to: Eminem, Nine Inch Nails, Jack Johnson, Michael Jackson, Sublime, Green Day, Breaking Benjamin, and Drowning Pool.
I hardly ever amp my headphones. I wouldn't suggest a pocket amplifier because...