Hey there,
I thought I was the only one that used higher end head phones for PC gaming...

Currently I'm using a Total BitHead and a set of HD650's for playing. I started off with 595's and they were great for gaming as well.
Mostly I play BF2, but everyonce and a while I revert to DC (I really miss the little birds)
It's amazing how much extra I can hear in the game. Lots of background noise, and sometimes even foot steps coming up behind me... saved my a death on more than one occasion.
The only down side for this setup is that since there's no MIC input on the TBH, if I wanted to use comms in BF2, it wouldn't work as it only wants to use one sound device.
But with TeamSpeak, I can control the where the sound goes and where the input comes from, so I output to my TBH and use the MIC input off of the onboard sound. I just use my old LogiTech headset, turned upside down around my neck with the mic twisted up as high as it goes... one day I've got to get a different mic.
I'm in Canada as well, and the good folks over at HeadRoom shipped to Canada, and I picked up my 650's off eBay.