Cheers, I'll be sure to give those a look.

I will say no for the bass emphasis.   So with the closed back headphones, would the Denon be the way to go? If so which one? Unless there is another that I should look into?

Extra bass could be fun, but only if it doesn't take away from the headphones. Like, only if the extra bass doesn't mean they focus less on treble, mids, durability, etc.   So how leaky would the HD558's be, in terms of letting sound in?

Alright, so I've got a buddy who's an acoustical engineer, and works for a hi-fi company. I asked him what good headphones I could get for around $150, give or take about 50 maybe. He told me to look at these:   Sennheiser HD558 Denon AH-D401 Denon AH-D340 Grado SR80i   I didn't really...