The Hfi-780s would give you more of a theater-like experience. A lot of people praise them for gaming, but there are also some people who say they never found them astounding for gaming. It's a toss up, primarily because Ultrasone uses S-Logic, which is basically supposed to emulate surround sound with the way the drivers are angled etc. When you pair that with something else that attempts to emulate surround sound, you can either get one badass surround effect or a horrible, cross reflecting sound cues. I don't have any experience, but I know I almost bought them specifically for gaming and movies. $170 is a sick price, they are also closed.
I didn't realize they are closed. I had to consider them because the were on sale and on Amazon they were one of the few that actually ships to Canada. The search continues I guess. I'm still waiting on a good price for some DT990/600ohm or DT880/600ohm.
There's a Long and Mcquade near me that sells the DT990 Pro 250ohms and the DT770 PRO 250ohms but I don't know how they compare to the Premium 600ohms. They are all around $180-$200