Heya,
Before even getting into headphones, there's an issue here. You may spend whatever you want on headphones, but they're going to sound like junk and you'll be wondering why you spent hundreds of dollars when you hear wretched audio coming out of your
laptop as your source. I can't stress enough that if you're going to jump into higher end headphones, having a good
DAC is going to be paramount. Poor audio quality as a source coming over expensive high end headphones will sound like butt. So would tell you to either extend your budget and get mid-level headphones ($300ish) and get a quality DAC (and potentially AMP built in too) to cover your bases. May need to jump to $600 as a budget to do this and not essentially waste money on something not as good.
Surround sound technology is a market term. There's no such thing. Most drivers in a headphone is
two and very few at that. Surround sound positioning is done via software/emulation. It's not a hardware thing unless you physically have 6 or 7 speakers (ie, drivers) surrounding you with discrete audio from each one. That's real hardware surround. Everything else,
everything, is emulated. And can be done on simply
two drivers. That's why it works in headphones, and is marketed as `surround' when it's no more special than
any pair of headphones. For this you need the right software, or hardware (soundcard, or DAC capable of similar feat).
That said, I'll just throw this out there as a recommendation.
Matrix Cube DAC + BeyerDynamic DT990 600ohm or Sennheiser HD600 (or 650's if budget permits).
The Cube is a great DAC, plenty of inputs, and it's built in amplifier is more than enough to power those headphones.
Very best,