Krutsch
Headphoneus Supremus
I just ordered a 650 last night from bhvideophoto for $313.99 flat. At the time i thought it was a good deal but I'm not so sure anymore. I wanted them because I thought they were a big step up from my 598s, but after looking at some reviews, many say that the 650 is boring and the 598 is more engaging. I use my 598 with gaming and I love the soundstage it produces, I wish it had more bass but it's still nice and tight. Ive also heard the 650 has a smaller soundstage. I may just return the item immedietly without opening it to avoid the restocking fee
Update: I plan on using them with a Cayin C5 portable amp.
I have both the 598 and the 650. I could see why you would love the 598 for gaming, but for music, the 650 is in a whole 'nother league.
That said, coming from the 598, you will need time to adjust to the 650 (read: listen only the 650 for a period of time, like a week or two, and see that you don't love them afterwards).