Reviews say the K7xx doesn't have a good sound stage? Or are you referring to the DT 880? Because the AKG K7 series headphones and Q701 probably have the biggest sound stage in headphones for under $500. My K7xx certainly has a considerably larger sound stage in every dimension than my DT 880 Pro 250 Ohm.
A. Yes I was referring to the DT 880
If the DT 880 600 Ohm isn't comfortable to you then I would imagine no headphones would be comfortable to you except maybe the Stax SR-007/SR-009, HiFiMan HE-560 and HE-400i and maybe HE1000, and/or Sennheiser HD 800.
A. Whats not comfortable is just on my ears.. after extended time periods they feel really heavy and weighed down and once I take them off my ears feel much better (this might be a common thing this is the only nice pair of cans ive ever had)
The K7xx is a bit lighter (235g vs 290g according to specs), has larger circumference and deeper pads that aren't quite as soft as DT 880 pads but soft enough, and the DT 880s have a solid but heavily padded headband while the K7xx has a suspension headband (offloads weight) with a leather strap (which I can feel after a few hours of use, unlike my DT 880 Pro which has a tighter clamp than your 600 Ohm one).
Assuming the DT 880 600 Ohm has a very similar sound stage to the Pro 250 Ohm model, the K7xx will be a noticeable improvement for gaming but mostly a sidegrade elsewhere. I wrote my thoughts about K7xx vs DT 880 Pro 250 Ohm here if interested:
http://www.head-fi.org/products/akg-k7xx/reviews/14452