About using Silent Cinema with headphones, it's alright I guess. I used it for a few months and did okay with Ultrasone HFi-2200's. I've also tried Sony's VST which wasn't bad either. I picked up a Harman Kardon receiver with DH and dang.... it kinda blew me away. Soundstage just opened up even more. If I had to rate it, it'd be DH > SC > VST.
I still need to try the AD700 vs HFi2200 to see if I'm missing out on anything.
I will second Silent Cinema not working well. I used to use it all the time. The sad thing was I never even realized it was supposed to be emulating surround sound. I feel like that says it all. I was mostly using a poor set of cans at the time, but even so. The Dolby Surround works infinitely better. My Victor SU-DH1 has been working like a champ. I will likely be selling it next month, but not do to any flaws in its performance. I have not tried the Mixamp or DSS, but I assume both work equally well for gaming.
Edit: I am also very interested in trying the AD700's. I think I have convinced a friend to buy a pair. Another one of my friends already owes some DT770pro. I am looking forward to getting them all in one place. Too bad I sold my DT880/600, I hear those are also good for gaming (I sold it before I bought the DH).
Edited by TruBrew - 4/7/11 at 9:49pm